Clutch Slave Cylinder Question
 

I want to get a new clutch slave cylinder for my car from Mazdatrix but they're listed as 81-82 or 83-85. My engine came from a 82gsl, but it wasn't the original engine. And now it's in an 85 GSL, and before that it was in an 85 GS and I used the slave cylinder that was in the two previous 85s. How do I know which clutch slave cylinder I need?

Call them up

I'm not sure which one you need, but the 81-82 clutch slave pushrods have a locating pin at the clutch fork end, the 83-85 (except SE) do not. A look at the pushrod that's in the car now should show you what you need.