bocoogto, You might be able to I D the carrier by the housing (if its the stock carrier) by checking the numbers that should be near the rear and center
of the drivers side axle tube. The left backing plate should also have a number on it.
But to be sure, look for a number on the carrier. You'll have to take it out anyway.

I assumed you were working on a bop 8.2. If its a GM 8.5 I think the number is on the right side.Not sure.
I would be interested in what you find out!
Ron