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HI,
I used 66mm (+21mm) for my 21mm rear spacers and managed to install with the hubs in the car using the same method as cloggie. Lost of people safely use adapters instead of spacers, but for peace of mind I like the ability to check the nut torque directly on the stud. I used 2mm spacers at the front to mitigate some inner fender rubbing - I don't think I'd want to go +7mm with stock studs, but if I did would use an open nut to at at least verify enough engagement.
John
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