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When we first lined up the holes to bolt on the new 11-inch drums, we were a little concerned that the inner diameter of the Master Power backing plate was larger than the outer diameter of the stock 10-bolt axlehousing it was being bolted onto. Master Power's tech line explained that these kits also fit 12-bolt rearends. As long as the bolt holes line up, you're good to go. We bolted the new drum backing plate and tightened it all down using the stock hardware.