upper control arm question

[stefan]

i have a 72 c10 half ton,my question is i came across a pair of 1973-87 djm upper control arms,well my spindles are 73-87 djm 3 inch spindles and i want to know is there a diffrence between 73 and 72 upper arms and if not will they fit right up because the ball joint is the right one for the spindle but i just wonder if the rest of it is the same as a 72 as far as over all length and where it bolts up,thanks for any help.