If this info. helps. I bought my car 66' tr4a irs in 1976, 10 years old:
Commission, CTC 53788 L; Engine, CT54022E; Body, 54244 CT; Gear box, CT 53928; Diff, CTC 56571; Rear suspension, Left V2968/#307052/E471 and Right V2968/307053/$472 .
Robert
66' tr4a irs
CTC 53788 L