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If you were using a washer before then you have already accounted for its thickness in relation to where the nut engages the bolts treads. Did ATS recommend new nuts or just use the ones that the threads have already been torqued to yield ?
Any how, just because it is a common practice doesn't make it correct. But at least you know what to check first if you get, death wobble, wander or some other handeling quirk.
No they did not recommend new nuts. They said just go slow when removing the nuts but that I should not have any issues. Worse case scenario I'll inspect the threads on the nuts and bolts after removing and if they don't look right I can order new bolts and nuts.
My other option would be to add a couple more washers. The bolts look long enough.
For some piece of mind ...the bolt will stretch further and lose clamping force before it reaches ultimate yield. Rarely can they be driven long enough to actually break the bolt, they just come loose.