I've ran crager SS wheels on my 69 swinger for a long time and you need to use the special lug nuts that counter sink into the wheel itself. Don't think over the years I can remember any long studs on a 4" bolt pattern rear end as at that point we would upgrade to a larger bolt pattern as well as other axel's. Maybe something like summer brothers etc. Never had a problem with the correct lug nuts that were supposed/supplied to use with the cragers. Not familiar with the 61C part ?? Probably a manufacturer number ??
Also you say these are the drilled 5x4 bolt circle. Not sure what you mean by that. Did someone drill them or the manufacturer ??
I can post a picture of the specific lug nuts later if needed.
Good luck
These wheels aren’t unilug as we are used to in the past. I’ve had too many issues over the years with them coming loose, even after being torqued to spec. Cragar manufacturer now supplies non unilug, drilled versions. Round whole, not egged.
Yes. Could you please post a picture of that lug nut when time permits.
