Here's some mounting info, location of the caliper bracket flange on axle if using the original 2007 rotor, equivalent to NAPA # 86828.
The measurement from original axle is from caliper bracket flange on axle tube to the outside of the hub (because the rotor sips over the hub).
3-15/16"
PICTURE To mount the same rotor on the back side of a hub (like old drums often were) the thickness of the rotor at the flange needs to be added.
0.400" thick
PICTURE So if welding new flanges on the axle tube they should be 4.3375" (or a hair over to 4-5/16") measured from behind the hub flange where the rotor will mount.
To use alternate rotor with smaller bore, NAPA #86830, the math is different.
The rotor is not as tall by 0.177"
PIC 1 PIC 2 PIC 3, the difference The flange is thinner, measures 0.328"
PICTURE 4.9375 - 0.177 + 0.328 = 4.0885" or a hair over 4-1/16"
I'm thinking the original rotor in combination with an adapter bushing will be the best solution, so 4.34" is the distance for the flange on the axle behind the hub.
