Fostex R8 main gear cogs though if you get a

though if you get a noisy one let me know as I remember on my unit was one and forgot now which one it was

for most people if not all they just need the arm assembly as rest is inside the unit

This is heavy so has to go by courier collection possible with a discount

The caps have a different longer thread  to them the TSR8 cap is a straighter side but fits the 38 and vice versa e 38 cap has a bevel the TSR8 is straight a photo is included so you can see the difference

Fostex R8 main gear cogs though if you get aThese are the pair of gear cogs in a Fostex R8 that work with the capstan motor and over time can get brittle and crack