From our inventory of over 1,000,000 NOS Mopar parts:

This is a new old stock starter pinion shaft gear and snap ring package #2275557 for Chrysler starters from 1961-1978. 

It does not fit 66-69 HEMI 4 speed, or slant 6 with Heavy duty manual transmission.

It fits the following starters:

2095150

2098500

2875560

3656575

3755900

From our inventory of over 1,000,000 NOS Mopar parts: This is a new old stock starter pinion shaft gear and snap ring package #2275557 for Chrysler starters from 1961-1978.  It does not fit 66-69 HEMI 4 speed, or slant 6 with Heavy duty manual transmission. It fits the following starters: 2095150 2098500 2875560 3656575 3755900