Bought a 71 442 the guy who owned it before put 8 inch studs on the rear axle tires are flat new Cooper Cobras waiting at the shop for me to bring the rims in going to buy a extra deep socket to get these lugs off I just need a correct size to go pick one up?

 

I would take an open end box wrench and find the size that fits. If the studs have been changed the lug nuts might be different from original.

 

8" studs? That's... impressive.
It "should" be 3/4 or 13/16, but there's even chances it could be either of those.

 

Depending on where you live, I could bring over my impact set and give you a hand if interested. Pm me if you are interested, I'm in the Toledo area.