front break rotors 6 lugs question 87- 91

[jerrylopz]

hello fellow chevy gurus... once again here with another question...
I currently have a set of drop spindles from cpp 73-87 with rotors 5 lugs, going into my 69 c10.(not yet installed) I would like to change the rotor to 6 lugs so I don't have to bother with the changing the rear differential. I know I can just call cpp and order the rotors but money is tight. today at the junk yard I found a 91chevy Silverado ss with 6 lug front rotors, I measured them and compared them with my current rotors on the rotors and spindles from cpp and they seem to be the same size bolt pattern 6x5.5 and same rotor size 12 inch disc. I am wondering whats the difference between the years 87 to 91 brake rotors 6 lugs and if I can use them on my 73-87 spindles. and is there other vehicles I can find them on.

thank you fellows..