lowering a 72 burb

[instgatr]

Alright guys I've got a question I ordered a pair of drop spindles for my 72 burb and the ball joints are to big for the spindles. It's a 72 c10 5 lug. Any way did they use different ball joints and spindles for burbs or do I just have a strange one? I looked up parts on different parts sites and they list c10 pickups and burbs using the same ball joints. Just wandering if anybody else has ran into this. Thanks guys in advance