8 3/4 small pattern to large pattern swap, what drums???

Get ANY big bolt pattern drum/backing plate combo. Dana 60, 8.75, 7.25 and 8.25 all use the same parts for BBP. If you see a car in the boneyard with rear brakes on it and BBP, grab them.

The axle standoff distance is different from sbp to BBP. You can't swap or redrill your current drum. Additionally, the centering hole is smaller diameter on the SBP drums than the BBP