{"product_id":"granatelli-gms789464t-mushroom-twin-switch-plate-635in-barrel","title":"Granatelli Mushroom Twin Switch Plate .635in Barrel Universal","description":"\u003ch4\u003eLarge-Face Mushroom Button Twin Plate for Custom Racing Switch Panels\u003c\/h4\u003e\n\u003cp\u003eThe Granatelli GMS789464T is a mushroom twin switch plate that accepts two large-face mushroom .635-inch barrel-style switch buttons arranged side by side. The mushroom button profile provides a wider, more tactile actuation surface compared to standard face buttons, making it easier to locate and operate switches by feel while wearing gloves or under the physical demands of track driving. Compatible with the Granatelli 10-inch D-shaped racing steering wheel switch panel and any housing that accepts .635-inch barrel switches. Switches and the steering wheel are sold separately.\u003c\/p\u003e\n\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMushroom Button Format:\u003c\/strong\u003e Large-face mushroom profile provides a wider, more tactile actuation surface for gloved or high-stress driving environments\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual Side-by-Side Layout:\u003c\/strong\u003e Accepts two .635-inch barrel mushroom switches arranged side by side for independent actuation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal Fit:\u003c\/strong\u003e Compatible with any switch housing or panel that accepts .635-inch barrel-style switches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRace-Ready Construction:\u003c\/strong\u003e Built to Granatelli's competition-use standards for reliable actuation in demanding environments\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003eGMS789464T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eGranatelli Motor Sports\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSwitch Button Diameter\u003c\/td\u003e\n\u003ctd\u003e.635 in (barrel-style)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eButton Count\u003c\/td\u003e\n\u003ctd\u003e2 (side by side)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eButton Style\u003c\/td\u003e\n\u003ctd\u003eLarge-face mushroom\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFit\u003c\/td\u003e\n\u003ctd\u003eUniversal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch4\u003eWhat's Included\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e1x switch plate\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eAbout Granatelli Motor Sports\u003c\/h4\u003e\n\u003cp\u003eGranatelli Motor Sports is a California-based performance parts manufacturer with roots in professional motorsport. The company produces ignition systems, interior accessories, and racing components used across drag racing, road racing, and high-performance street builds.\u003c\/p\u003e\n\n\u003ch4\u003eRelated Parts on Our Site\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/interior\"\u003eBrowse All Interior Accessories at Black Ops Auto Works\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eFrequently Asked Questions\u003c\/h4\u003e\n\u003cstrong\u003eWhat is the GMS789464T?\u003c\/strong\u003e\u003cp\u003eThis is a Granatelli Motor Sports mushroom twin switch plate that accepts two large-face mushroom .635-inch barrel-style push buttons side by side. It is a universal accessory for drivers who prefer a larger, more tactile button surface for switch actuation while wearing gloves or driving at track pace.\u003c\/p\u003e\n\u003cstrong\u003eWhat is the difference between mushroom and standard face buttons?\u003c\/strong\u003e\u003cp\u003eMushroom buttons have a wider, raised dome-shaped cap that extends above the panel surface, providing a larger actuation area and a more positive tactile feel. Standard face buttons sit flat to the panel. Mushroom buttons are generally preferred in racing applications where switches must be located and activated by feel alone.\u003c\/p\u003e\n\u003cstrong\u003eWhat is the difference between the Granatelli switch plate options?\u003c\/strong\u003e\u003cp\u003eThis plate uses two large-face mushroom buttons side by side. The standard twin (GMS789465T) uses two flat face buttons side by side. The double (GMS789464D) positions one button per side for wider spacing. The single (GMS789464S) accepts one button with 4-position orientation. Choose based on button style and switch count needed.\u003c\/p\u003e\n\u003cstrong\u003eIs this compatible with the Granatelli 10-inch D-shaped steering wheel?\u003c\/strong\u003e\u003cp\u003eYes. This plate is designed to be compatible with Granatelli's 10-inch D-shaped racing steering wheel switch panel and any housing that accepts .635-inch barrel-format switches. The steering wheel and switch buttons are sold separately.\u003c\/p\u003e\n\u003cstrong\u003eWhat switch buttons are compatible with this plate?\u003c\/strong\u003e\u003cp\u003eThis plate accepts .635-inch diameter barrel-style push buttons. Verify your intended switches match this diameter and barrel mounting style before ordering. Switches are sold separately and are not included.\u003c\/p\u003e\n\u003cstrong\u003eAre switch buttons included?\u003c\/strong\u003e\u003cp\u003eNo. This is the mounting plate only. You will need to source compatible .635-inch barrel-style switch buttons to complete the installation.\u003c\/p\u003e\n\u003cstrong\u003eCan this be used in a street car?\u003c\/strong\u003e\u003cp\u003eYes. This is a universal accessory and can be installed in any vehicle with a compatible switch panel housing, not exclusive to competition use.\u003c\/p\u003e\n\u003cstrong\u003eHow do I wire the switches after installation?\u003c\/strong\u003e\u003cp\u003eWire each switch button to the intended circuit per the switch manufacturer's wiring diagram. Ensure each circuit is properly fused. For safety-critical applications such as kill switches or fire suppression, consult a professional installer familiar with competition vehicle wiring standards.\u003c\/p\u003e\n\u003cstrong\u003eWhat material is the plate made from?\u003c\/strong\u003e\u003cp\u003eRefer to Granatelli's product documentation for specific material information. The plate is built to Granatelli's race-use standards for durability in demanding competition and street environments.\u003c\/p\u003e\n\n\u003ch4\u003eInstallation Instructions\u003c\/h4\u003e\n\u003col\u003e\n\u003cli\u003eVerify that your switch housing accepts .635-inch barrel switch buttons and that the plate dimensions match the panel cutout.\u003c\/li\u003e\n\u003cli\u003eInsert the plate into the panel housing, aligning the button holes with the housing cutouts.\u003c\/li\u003e\n\u003cli\u003eSeat the .635-inch barrel switch buttons through the plate holes and secure per the switch manufacturer's retention method (clip, nut, or snap-fit).\u003c\/li\u003e\n\u003cli\u003eWire each switch button to the intended circuit per the switch manufacturer's wiring diagram; ensure proper fusing on each circuit.\u003c\/li\u003e\n\u003cli\u003eConfirm all switches actuate freely before securing the panel in the vehicle.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Granatelli Motor Sports","offers":[{"title":"Default Title","offer_id":46058236837967,"sku":"GMS789464T","price":13.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/Screenshot2026-07-15at4.30.30PM.png?v=1784147456","url":"https:\/\/www.blackopsautoworks.com\/products\/granatelli-gms789464t-mushroom-twin-switch-plate-635in-barrel","provider":"Black Ops Auto Works","version":"1.0","type":"link"}