I am new to this site as well as also Mazda's. I am normally a Toyota and Nissan Guy but this car ran into me when a friend moved to Canada and signed over the title to me. It is an original but not stock Mazda Rx-7 RHD. I did need a few things and was sent to this site for help. The rear diff. on the Rx-7 went out. I later found out that this car was converted from an Automatic to Manual, Had the engine completely rebuilt with a ACT stage 4 clutch but the rear diff was left alone. I am currently looking for a 4.10 rear diff and or something that is compatible and reliable.