Hoping you guys can help me out with some technical questions relating to a 4 speed rebuild I'm doing on my 73 RX3. I know these are probably not too commonly rebuilt these days but i have 2 dual distributor 12a motors and want to keep the car original! Transmission was somewhat noisy and expected idler bearing. Pulled to investigate and found lots of side to side play in the input shaft. I know some play is normal but this was excessive. Pulled the transmission apart and quite pleased with the condition of everything. Gears and synchros look great. So now I'm trying to track down the necessary parts to re-assemble. Collected some part numbers but can anyone help fill in the gaps?

Front input shaft bearing - NSK 6307N, National/Timken 307L - located
Rear main shaft bearing - NSK 63/32N, SKF 6332N - located
Countershaft front - ? SKF 3205ANR - ordered but haven't received yet so cannot confirm 100%
Countershaft rear - ? No markings on it but still available via Mazda R501-17-290A. Does anyone have a non-Mazda Koyo/Timken/SKF etc. part number for it? Mazda wants $120 CAD + tx for it.
Input shaft needle bearing - ? 20m long, 20m ID, 28m OD?

Thanks!

 

Were you able to rebuild the transmission or did the project end?