Upper Control Arm Question

[dave2953]

I have a 68 SWB with drums up front. I started to rebuild the front crossmember and suspension components from a 69 crossmember that I acquired and have already cleaned and painted the upper control arms, as well as removed the ball joints. I just got a 79 1/2 ton with discs and the 69 upper control arms look to be the same as the 79 upper control arms, but I'm not sure if the balljoints are the same. I just don't want to have to clean/paint and remove balljoints from the 79 if I can use the 69's UCA's. Sorry for the long post, and thanks in advance for your help.