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There are differing vac pumps for those alternators. There are ones available that are the same length as the one you have. I can still get 125a alternators so maybe its just patrolaparts supplier.
As for higher current alternators you could look at a 24v item which could produce 200A. Hook your batteries up in series so the alternator can supply the charge to the batteries. Then only come off one of the batteries so the rest of the car can run off 12v. There is a little more to this sort of setup but it opens up a lot more options for alternator output options.
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