Spline Drive Lug Nut Problem

[dragonlovestrucks]

Hey all -

I have a '77 C10 Big 10 edition.

The problem I have is that the lug nuts that came on the vehicle have a spline drive on them, and I have yet to find a socket that fits them.

I've checked all the haunts - Oreilly's, AZ, Discount Tire and 4WD truck places. I even special ordered a set of spline drive lug nut sockets from Amazon - all of which were too small.

Typically speaking there is 3/4 OD lug nut for this type, but I can't seem to find anything one size up. When I go to 13/16, it is too big, and I can't find something that would fit it anyhow!

Does anyone have any ideas what this beast is, and how in the F*** I can get it to come off?

Otherwise, I have to buy 20 sockets and hammer them on...