[ccjohnson]

Try looking in a salvage yard that has been around for a long time. One other possibility is to take the rim you found to a machine shop and have the center bored out to fit. Make sure you don't use a flat faced nut "hub" centered rim if you need the acorn nut "stud" centered rim. Also check with a truck parts store or truck tire shop. You may want to consider upgrading to tubless tires & rims all the way around.