Seat post spring, extra heavy | Color: | Order Number: R3129-31C | OEM Number: 51773-31

All models '31-'80. Singles, D, DL, R, RL, W, WL, WLA, WLC, WLD, V, VL, VLH, U, UL, ULH, EL, ELC, Knucklehead, Panhead, FL, FLH, Shovelhead. Servi-car '32-'73.