Where would fox head or part number be. I think I might have been had

I hope not guy seemed real nice and still advertises on 912 registry. I sent him an e-mail also inquiring. Whatever they turn out tobe I also need to know how to measure because I want to put some tires on them. I have a 67 912 and want to put as much tire as I can fit onto these rims which I think are 14 X 5.5 without making any modes to my arches, no spacers and keep it as close as I can to original so my speedo and tach arent so far off. I was told 195/70/14 Dunlaps by Cgarr but he has a 69 with differant arches.