The u-joints you are looking for, are those of the transmission shaft / axles?
If that's right, I had to change them on my Buick, it was complicated to find, but I found a model that was similar but I had to modify the new joints so that they correspond with the 'drive shaft .
here are photos of the original u-joints and the new ones :
the original one on the left and the new one on the right, you can see that the new one is different and I had it rectified so that it is like the original