JPP SR to RB25 Gear Box Adaptor PlateDESCRIPTION The JPP SR Engine to RB25 gearbox conversion plate has been designed and proven to be one of the only adapter plates on the market to eliminate the common mis alignment problems often associated with conversion plates. Issues such as popping out of gear, extreme clutch wear and spigot bush failure have been eliminated in the JPP design. The adapter plate is suited to run with multiple S15 style clutches but as all clutches are different a