{"product_id":"superpro-spf1991k-miata-rear-upper-control-arm-bushing","title":"SuperPro 1990 Mazda Miata Base Rear Upper Control Arm \u0026 Outer Bushing Kit","description":"\u003ch4\u003eRestore Rear End Precision on Your First Generation Miata\u003c\/h4\u003e\n\u003cp\u003eThe NA Miata earned its reputation as a driver's car through precise, communicative handling, but factory rubber bushings soften with age and let the rear suspension geometry drift. The SuperPro SPF1991K replaces the rear upper control arm bushings at both the inner and outer positions with polyurethane, bringing back the tight, predictable rear end feel the car was designed to deliver.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eReplaces rear upper control arm bushings at both inner and outer positions\u003c\/li\u003e\n\u003cli\u003ePolyurethane construction resists the wear and sag common in aging rubber bushings\u003c\/li\u003e\n\u003cli\u003eSPF1991K improves rear suspension geometry control during cornering\u003c\/li\u003e\n\u003cli\u003eReduces toe and camber changes under load for more predictable handling\u003c\/li\u003e\n\u003cli\u003eImproves tire wear by maintaining correct rear alignment\u003c\/li\u003e\n\u003cli\u003eDirect fit into the factory control arm mounting locations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eFitment\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eYear Range\u003c\/th\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eTrim\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1990-1997\u003c\/td\u003e\n\u003ctd\u003eMazda\u003c\/td\u003e\n\u003ctd\u003eMiata\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMPN\u003c\/td\u003e\n\u003ctd\u003eSPF1991K\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSuperPro\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePosition\u003c\/td\u003e\n\u003ctd\u003eRear upper control arm, inner and outer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003ePolyurethane\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eLifetime warranty on SuperPro polyurethane bushings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003eNot published by manufacturer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch4\u003eWhat's Included\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eRear upper control arm bushing kit, inner and outer positions\u003c\/li\u003e\n\u003cli\u003eInstallation hardware\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eAbout SuperPro\u003c\/h4\u003e\n\u003cp\u003eSuperPro has manufactured performance polyurethane suspension bushings for over 40 years, developing dedicated kits for platforms like the NA Miata that restore factory geometry and sharpen handling.\u003c\/p\u003e\n\u003ch4\u003eRelated Parts on Our Site\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/suspension\"\u003eShop more suspension bushings and control arm components\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eFAQ\u003c\/h4\u003e\n\u003cstrong\u003eWhat is the SPF1991K?\u003c\/strong\u003e\n\u003cp\u003eThe SPF1991K is a SuperPro polyurethane bushing kit that replaces the rear upper control arm bushings at the inner and outer positions on the 1990-1997 Mazda Miata.\u003c\/p\u003e\n\u003cstrong\u003eWhat symptoms indicate worn rear control arm bushings on a Miata?\u003c\/strong\u003e\n\u003cp\u003eCommon symptoms include vague or unpredictable rear end feel, clunking over bumps, and uneven rear tire wear.\u003c\/p\u003e\n\u003cstrong\u003eDoes this kit cover both the inner and outer bushing positions?\u003c\/strong\u003e\n\u003cp\u003eYes, the SPF1991K includes bushings for both the inner and outer positions of the rear upper control arm.\u003c\/p\u003e\n\u003cstrong\u003eWill this improve autocross or track handling on my Miata?\u003c\/strong\u003e\n\u003cp\u003eYes, replacing worn rubber bushings with polyurethane reduces unwanted suspension deflection and improves consistency during hard cornering.\u003c\/p\u003e\n\u003cstrong\u003eDo I need an alignment after installing this bushing kit?\u003c\/strong\u003e\n\u003cp\u003eYes, an alignment is recommended after replacing any rear control arm bushing to confirm camber and toe settings.\u003c\/p\u003e\n\u003cstrong\u003eIs this a direct bolt in replacement?\u003c\/strong\u003e\n\u003cp\u003eYes, the SPF1991K is designed to fit directly into the factory rear upper control arm mounting locations.\u003c\/p\u003e\n\u003cstrong\u003eIs this kit covered under warranty?\u003c\/strong\u003e\n\u003cp\u003eYes, SuperPro backs this bushing kit with a lifetime warranty to the original purchaser.\u003c\/p\u003e\n\u003cstrong\u003eDo I need a press to install this bushing kit?\u003c\/strong\u003e\n\u003cp\u003eA hydraulic press is typically needed to remove the old bushings and install the new ones, so a shop visit is recommended if you lack access to one.\u003c\/p\u003e\n\u003ch4\u003eInstall Instructions\u003c\/h4\u003e\n\u003col\u003e\n\u003cli\u003eRaise and safely support the rear of the vehicle on jack stands\u003c\/li\u003e\n\u003cli\u003eRemove the rear upper control arm from the vehicle\u003c\/li\u003e\n\u003cli\u003ePress out the worn factory bushings from the control arm\u003c\/li\u003e\n\u003cli\u003ePress in the new SuperPro SPF1991K polyurethane bushings\u003c\/li\u003e\n\u003cli\u003eReinstall the control arm and torque all fasteners to factory specification\u003c\/li\u003e\n\u003cli\u003eLower the vehicle and have the rear end aligned\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Superpro","offers":[{"title":"Default Title","offer_id":46296879038543,"sku":"SPRSPF1991K","price":89.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/superpro-spf1991k-miata-rear-control-arm-bushing-1_1befc98a-3456-48ca-aa20-3e0103bdbc88.webp?v=1785373236","url":"https:\/\/www.blackopsautoworks.com\/products\/superpro-spf1991k-miata-rear-upper-control-arm-bushing","provider":"Black Ops Auto Works","version":"1.0","type":"link"}