DJM Control Arm Problem

['87 Static Slam]

when i had DJM control arms installed i could not get the alignment correct. I had to make custom upper control arm mounting bolts (2" longer). then i had to use lots of shims and welded them together after it was aligned. Has anybody had to do this? Im starting to wonder if they put the arms on the wrong side. One side of the arm is longer than the other, can anyone tell me which side is which?

Also, does it matter if the ball joint is mounted on top or bottom of the control arm?

Thanks, any help would be appreciated.