As far as I know, all the repro tubs these days are MD Juan. There were some serious quality control issues a few years back, particularly in the fit of the tubs, but I have not been hearing those complaints so much lately.
I have also seen a few NOS early 60s USMC tubs surface on the G503 in the last few years. Not cheap, but not repro either.
Personally, my money says repair your tub. If the under floor channels are rusted out, you can have the tub off a M38A1 in a day. If the wheel well patches are the proper ribbed ones, drill out the pop rivets and replace them with weld. There are body sections available out of the US as well which can replace sides or corners if need be.
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