Check AMK 376276-S36 for a picture, 14-14X1.0 HH 3/8 drive 7/8 dia tooth dish, although yours should be a -S2 finish. The head marking is a small L in a large G, which matches the ones in my inventory. As a -S2 finish it was used on convertible and hardtop rear seats for 64 thru 67. As a -S8 and -S36 it was used on the steering column gasket for 67 and 68 (-S36). A longer type was used in for rear seats for 68 thru 70. This is per the assembly manuals.
Jim