Re: '57 rear axle and rims with Porterbuilt.
I currently building one my self. Haven't gotten to the rear yet, but I'm pretty sure the rear I have now will work. Its 57 1/4 inches wide from mounting flange to mounting flange and I have 16x10 rims with 4in of backspacing.
You definitely want to mock it all up with the bed on the frame!
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