aboard Not sure I'm sure somebody will chime in with the answer
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Are we talking about a six lug wheel? I believe they were 6.5" wide o.e. they will work.only problem might be if it has a big full floating rear axle that might cause a clearence problem with rear drum.
B300 has an 8 lug pattern. Stock wheels were also 16.5” dia. You can probably find later 8 lug wheels that are 16” to have better tire selection. That backspacing should fit though, I have wheels with 3” rear back spacing and front is 4.5” (they are staggered). Just make sure you confirm your current wheel size/lug count