Help me! Buying used spindles!!

[lil_sahara450r]

Hey all!
Been a member here for a few years but I just dont post much. I am in need of a little advice. I am going to meet a guy that has some drop spindles, supposedly for a 64-66 truck. They dont have part numbers on them but have "C10" cast into them with a little bell cast into them (I am assuming this means bell tech?). How would I go about making sure these are right? Also what measurements can I take to make sure what size rotor they are for (1" or 1 1/4" rotors)? any help would be appreciated!!

thanks
Brandon