I just rebuilt both of my vent windows in my 85’ this past winter. Ordered the original type butyl tape from Restoration Specialties. They shipped promptly via priority mail and I got it within a few days. 1/16” worked best for me. Took a LOT of patience and a couple attempts to get it right...
The holes in my, what I believe to be original, K10 center caps seem to be drilled out for a 1/4" bolt not 5/16"? The threaded holes in my rims are 5/16", so I drilled out a cap for a 5/16" clearance hole. But now the bolt flange hits the center hub on the cap and subsequently will not sit...