Yes, the number of bolts dictates whether it is a 10 or 12 bolt. The year of the rear end could dictate a different ring gear size as well. The diff cover shape will be a good clue on what it is. I've had really good luck with yukon gears as well as richmond. Here's a link to Randy's that might help you out. It says your car has a 12 bolt or a 8.2" 10 bolt if your rear differential is stock to that car.

Diff Wizard