Re: Who used 1/2" wheel lugs on their TR3 hubs?
Maybe me. But 70's GM cars use 7/16" lugs just like the TRs but a tad longer. Fords use 1/2" though.
For the front, I used Dorman 610-114 measures 7/16"-20x1 21/32". But this also required that I drill out the hole to 9/16.
On the rear, the TR studs screw in and are peened over. So to change them required that the hubs were off.
Do a search on Dorman. I saw 1/2" references there.