Good question. I have no way of measuring down to the thousands, but one is 10“ and the other is 10 and 1/16. so i would say one is plenty good and the other is questionable. I would use both, but thats just me.what drums measure out to? 10.060 is max per FSM
I would rather not split up, but if the package doesnt sell maybe we can work something outHow much for just the backing plates shipped?