Wilwood floating caliper issues

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OK folks need soem input. thought for the 79 Camaro drag car I would replace the WS6 rear ratchets(new/rebuilt calipers,new rotors drilled for the 1/2 studs) with Wilwoods Metric calipers. They bolt right on BUT unlike front or rear GM calipers the outer hole for the floating bolt is not grooved for a ribber O ring to take up slack. Wilwood's hole is 0.035 larger than the bolt even a new one so the caliper can rock ALOT on that free play and the free play with the rubber and sleeve under the bolt head. WIlwood's rech guy I talked to had no clue-wnet and got an answer-"they are made for dirt cars and need the slack"-so the caliper can move all around??

So options- try and hand groove the caliper for an O ring with a Dremel, ream the hole out to use a 13/32 brass tube that is only 0.008 larger than the bolt to reduce slop, use the new ratchet calipers, or say the heck with it and get a Wilwood rear kit with Dynalites. Have the 10.75" kit going on the front.



Oh Wilwood's own pads had to had the ears on the outer pad ground down to not bottom out in the hole drilled for them in the caliper!