If it were mine I would use the 15.5" as a test and to make the truck drivable, then you could do some more research on the original and maybe come up with a plan to repair it.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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