I had my eyes on it already too. I think I mentioned it to another TD owner on Youtube, but he said many of them require oil to be hooked up to them and the install can get sort of tricky. I'd much prefer to install an alternator with vacuum pump too.

You can also buy it on amazon: description: Alternator Compatible With/Replacement For GMC, Isuzu Medium & Heavy Duty Truck 3.9L 4BD1/4BD2 with Vacuum Pump Included 12 Volts, 70 Amps 291276-000-0, 897023-733-1, 94052404, LR170-418, LR170-418B

https://www.amazon.com/Alternator-Compatible-Replacement-%E2%80%8E291276-000-0-897023-733-1/dp/B0073GGSKK