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Does any 20" with the same M715 bolt pattern can be interchanged on those stock axles ... i can have 12.50R20 xl 30% used for about $300 for the set of four .... want to know if possible to have any oem wheel that fir the M pattern .. I know there alway aftertrmaket wheels but ...... if i can found a set that will be bolt on ... a plus !!!
Nope.
There are a handfull of 50's-era trucks that had the same bolt pattern as the 715, but they were even skinnier than the stock wheels. I think they were all around 16", too.
If you really want 20's, grab a pair of rockwells.
I doubt they are out there. If they are they would have to be custom. I did however, get a trailer from the local power company and it has a standard chevy 8 lug pattern with 20" rims on it.