I think that is the ticket. The 10" x 2.5 would be perfect. The reason the mount pads are different is b/c of the different shoe width. I went through this on mine. Had to buy a set of backing plates with for the right shoe width as the originals weren't right for the brand new drums I had. Anyhow if the backing plates from the 7.25 work on the 8.75 use em'!