James, oil seal transmission maindrive gear. Rubber OD - 65-E66 4-sp B.T.; 4-sp L81-84 B.T.; 5-sp 80-90 B.T. (NU) 502306 OEM replacement reference 16774-72

OEM replacement reference 16774-72

Injection-molded frame w/wide-periphery eye port for enhanced side visibility

It is designed to be used as a seal between inner primary housing and engine crankcas (like the 60629-55 gasket that H-D used on the earlier 55-64 tin primaries)

18mm O2 port plugs included

- 23cm with 5/16" & 3/8" eyelets - 40cm with 1/4 & 3/8" eylets - 16cm with 1/4" & 3/8" eyelets

James, oil seal transmission maindrive gear. Rubber OD - 65-E66 4-sp B.T.; 4-sp L81-84 B.T.; 5-sp 80-90 B.T. (NU) 502306 OEM replacement reference 16774-72For 4 speed models fits 4th gear, for 5 speed models fits 5th gear. OEM replacement reference 12013, 12013A.