The stock ones are pressed in and the yokes are peened (crushed) to hold them in.

The peen needs to be reamed out, then the old joint pressed out. The holes then need to be reamed to the correct size for a new joint, then something to keep them in. Either they can me machined for a snap ring (which the factory doesn't have at all) or they can be tack welded in. The issue is they need to be centered in the yoke and if this off just a tiny bit you'll have a horrible vibration.