[Ironhorse]

No expert for sure as still learning after a good number of years playing with trucks but....the 3/4'' lug wrench I matched up to the lug nuts that came on a 67 GMC 1/2 ton of my BILs. The 13/16'' lug wrench I matched up to the lug nuts that came on a 70 Chevrolet 3/4 ton I parted. Thinking a C30 or 1 ton uses 7/8'' lug nuts originally. Hope that helps out altho possible lug nut size and thread size can be of changed thru the years.

I do have a couple more 3/4'' and 13/16'' lug wrenches I have not cleaned up yet if you have an interest. LMK.