Chevy used a smaller u-joint than Pontiac, and even though both are the c-clip rears, yoke is different. As mentioned, carriers have nothing to do with the yoke. You can't mix 10 bolt BOP, 12-bolt Olds or chevy 12-bolt yokes, none will interchange. To use the Pontiac driveshaft you must use the Pontiac 12-bolt yoke which are exceedingly hard to find. There is a u-joint available to mix the chevy yoke with the Pontiac driveshaft. Your pictured code appears to be a chevy c-clip rear code.
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