Anybody know if COAA-6550-A is a good number for a '64 Truck with 3 on the tree. I would think it's fir a car, have been burned buying parts before. Seems nothing is simple anymore for some reason.

I want to lay in this part on hand, it is listed as 10.5" but I see some listings as "fine spline" and that gets my ears itching, my drawer full of unusable parts is plenty full already. I see C3TZ-7550-? as the truck version?

Thanks in advance. Ted