drop spindle ?

[oldno7]

So afew years back I purchased a set of early classic drop spindles. I know they require disk brakes, and thinking I need to run the 5x5 bolt circle rotor. So does anyone have a 4 3/4 rotor that will fit my spindle's. Or does anyone have a drop spindle that uses 4 3/4 setup for these truck's. I would like to have more choices when it comes to my rims as their are more 4 3/4 than 5x5. Also what is the proper way to measure the spindle. Thanks in advance oldno7