part numbers??

I have part numbers 18023838 which is on a spindle and part number 18023022 which is on a caliper and Im not too sure they go to these cars. I searched on GM parts direct with no luck......any help identifying these??

Casting numbers are often similar but not legitimate part numbers, so you may just have to find someone with the same numbers on theirs. You might also consult a salvage yard. Their books might have some info.

I picked up a complete LS1 front brake swap (spindles, calipers, lines, speed sensors, hub assemblies and the wiring harnesses) plus a power top motor/resivoir for a convertible for 120 bucks......the casting numbers threw me at first but I dug around and figured out they are from an LS1 car....Thanks for your help!