Caliper and Spindle ???

[jr1966]

Ran into another problem on lowering my 69 GMC. I ordered CPP 2 1/2 inch Drop spindles and when I went to install I noticed the Calipers mounting bolt holes seemed to look different.
The bolt holes on the spindle now on the truck were 5 3/4 inches center to center and the new spindle mount holes were 7 inches apart. No fit on these ? I called CPP and they said it looked like according to the measurement that I had S10 spindles and Calipers. The Tie Rod hole is not the same size and no fit also on new Cpp spindles. Did not check Ball Joint fitment.
Anyone heard of this before and best way to resolve.
Get S10 spindles or start all over. Front suspension was supposed to be from 82 model. 1 1/4 rotors fit both spindles OK.
Thanks for any ideas
JR