I have seen a 1 ton IH pickup at shows that is running tubed radials on the 6 lug Budd locking ring rims. I also think Mark is doing the same thing. I spoke to the guy w the IH, he said it rides and drives much nicer and that he hasn't had any problems in the 3 yrs he's had the tires on the rims. When I was driving tractor trailer in the late 70's, they put radials on the locking ring Dayton wheels w/o incident and they made quite a difference in the ride and traction in snow. I have been told by a local truck tire guy that the narrow locking ring on our 1 tons may not be wide enough to properly support the bead of a tubed radial and advised me against going that route, so I bought a complete set of 7:00-16 bias ply tires. That's just two different opinions, but I'm running duals on my rear, and I know even with the dual offet rims sidewall clearance between the tires would be an issue w radials. Hence my decision to stay bia ply. Short answer to your question, there is a 17.5 drop center that will fit your lug pattern, but I don't know if it will clear the rear drums.