74-91 13B Rx7 Hardened Rear Stationary Gear & Bearing (N370-10-E10B)
Also fits the 90-95 Cosmo 13B engines.
Came stock on all 89-91 13B engines but can be used with any 13B block.
Nice for upgrading pre-1989 13B engines to hardened gears.
Includes main gear bearing (0820-10-502B) and rear main seal, both installed.