I can do them now (not yet as a distributor), but the price is not cheap, would be $350 each because it is going through distributors. You'd be on the hook for shipping to you also, figure another $25 or such. Not cheap, but also not too terribly bad to correctly double the output with a brand new (not reman) modern technology unit and 3 year warranty.
Personally I think it is too expensive to stock one as a spare at that price level, but if yours took a dump, then it would be worth it as a very nice upgraded replacement. The Chinese "Delco" clone is rated at about 70 amps, so nearly same as stock, but it has mixed reviews and un-forecasted longevity. This one is rated at 130 amps, nearly double, and won't commit suicide when charging low batteries. Twin internal fans, with 8 rip serpentine pulley, plenty of cooling air, temperature compensated internal voltage regulator. Option to use remote sense or not. Will not over-volt, doesn't care about engine shut down switch order. References B+ stud if remote volt sense is lost or not used. Is SAE J-180 short mount, can mount to J-180 long bracket with 4" spacer tube like the Wolverine kit and others have done, or acquire the civilian alternator bracket from your local salvage yard or dealer.
I want to gauge interest first before selling any, as I don't want to break any rules here. If there is enough interest in the above situation as it is (say 5 minimum combined), then I will upgrade my SS status to vendor and publish a listing. If not, then we will re-visit this later at a lower price level if HR tells me I can become a distributor for my own company products, without being a conflict of interest. I don't want to lose my career job over trying to get a few good alternators onto old trucks. If you absolutely have to have one soon, the price is $350 plus shipping ($375 total), and I would need a minimum of 5 commitments before kicking it off.