Hi,
Try Porsche, as the P51 is ostensibly a Porsche/ZF patented gearbox.
I think the bearings maybe the least of your problems, as the synchro-bands wear out and there are none in stock anymore, which means you'll have to get them custom made - asuming your synchros are worn out.
I haven't checked fully through the P51 repair manual to see if they show the measurements for the synchro-bands (to determine if they are worn out). But if you are rebuilding the box you should also get the synchros replaced. It'd be a tad annoying to get it all rebuilt only to find it crunches gears due to some worn synchros.
seeyuzz
river
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