4 speed clutch replacement

I have a 1974 Duster 360 with a 4 speed and the clutch is shot. I was looking up replacement clutches online and there seem to be quite a few variations due to spline count and fly wheel tooth count. Anybody know what I need most likely? The car is original stock. Wanted to get the parts ordered before dropping the trans. Please let me know. Anything helps.

James :burnout: