This bolt holds the shifter assembly to the trap door assembly.
34060-52 1952-1976
35336-74 1977-1984
This washer provides thrust support to the shifter plate that rotates to change gears.
The Iron Sportster trap door assembly holds the mainshaft, countershaft, and shifter mechanism. The Iron Sportster shifter comes as the 34009-52 assembly.
34060-52
1952-1956
35336-74
1977-1984
This washer mounts in a recess in the holder so that the shifter shaft can clear it, as it comes out on the left starting in 1977.