Tubular control arms for 3/4 burb

[zombiescustoms]

I need to replace all the bushings and ball joints in my 89 R2500 Burban, I called CPP an inquired about their tubular control arms and they said they mine are different than a 73-87 1/2 ton, The only differance I see is the type of bushing used, can anyone shead some light on this? The guy at CPP stated the cross shafts are where the differance is but compairing (from memory) the Burb to my old 80 C-10 they look Identical. can some one give me some measurements off a set of stock c-10 cross shafts? I probly just neet to know if the hole spacing is the same.