Rear disc Brakes on 8 3/4

Will this kit fit an 8&1/4 rear ? The backing plates for an 8&1/4 drum brake setup are the same bolt pattern as an 8&3/4.

I just looked at my 8.25 to compare it to my 8.75. i don't believe it will fit the 8.25; I'd probably go with the Hrand Cherokee disc conversion on the 8.25 (which is what I'm doing with this axle.