Any parts for the 1973 Yamaha AT3 will be added here.SEAT, BATTERY Part number 173-82122-00-00 1969-1976 Yamaha AT/DT 125Buy Now1969 -1976 Yamaha AT1 AT2 AT3 CT1 CT2 CT3 DT125A, B, C Damper 248-21746-00-00Buy NowYamaha wiring harness CONNECTOR COVER 214-82599-00-00 HT1/LT2/AT1/CT1/DT1/RT1Buy Now