Bartamos....My truck is a 1970 C30 mason dump....See my post titled '70 C30 wheel conversion' Fastenal was the solution that had a 1/2x20 nut with a flange 10 per bag @ $7.59....Isn't that sweet.... My luck on line, as with e-bay didn't turn anything up.... If you view my post on the wheel conversion Grigg was helping me, much appreciated.... but at the end of the day, I ended up using the original type wheel.....I wanted to avoid the rim with the outer ring & tube, but to no avail....I used two of my original wheels & located 2 more....Right now they are out being sandblasted & powder coated (after I straightened with the torch the sledge hammer blows on the edges) ....all set up by a truck tire shop where I will purchase the tires...I opted for radials 215/85/16, rather than the bias 750/16 which I would have preferred but they had no source other than Coker. Seeing they were so good about breaking down 7 wheels to find two good ones I felt obligated to by the tires they had in stock...Goodyear/Firestone.....Can't bring myself to buy & look at the Chinese brand.....despite the savings.....I'm still amazed on how stupid people can be....The guy I got the truck from had the original rear inner wheel with the late model wheels on the outer, neither hub or lug centric just a couple of large flat washers with standard coned lug nuts installed backwards....