Small Block Ford to GM TransmissionAuto Trans Flexplate SpacerFlexplate Adapter Sleeve; Transmission Adapter For Flexplate; Platinum Series; Xtreme Duty; 4mm Thick Centerplate; SFI; For Use Ford Small Block To GM Transmission;FEATURES:Fits Both High Inertia And High IntegrityCrank sleeve adaptors available for Ford & GM applications, fit both High Inertia and High IntegrityOver a decade ago, PRW Industries, Inc. (PRWI) recognized the need for branded, high-performance after-market parts that were value priced, and readily available on an in-stock basis. After a great deal of market research and further product development, the Performance Racing Warehouse (PRW) lineup of products was introduced to the performance after-market industry. All PRW and Performance Quotient products are manufactured in PRWI production facilities under the scrutiny of our technicians and inspectors to ensure that our products meet or exceed SFI specifications and other industry established quality standards, guidelines, and mandates.