[46international]

I have a '59 292 motor that may have come out of a truck and I'm having a hard time finding a ring gear for it, it uses a 11" clutch. I ordered one off of the internet and it was too small to expand over the flywheel. I have found another one at NAPA and they list the inside dia. After measuring the flywheel, and comparing that to the listed I.D. it looks like the gear will have to expand .15 total to go over the flywheel. That sounds too much. I did not measure the other gear before I sent it back, but it was too small.
I guess what I'm asking is, is there a difference in ring gears for flywheels that use the 11" clutch? What about if the flywheel came from a truck, maybe even a large truck?