Hummers use a cs144- a out 125 amp iirc from 1993-2004.
Nice thing about powermaster is they will set them up to start charging at lower rpm if you want and they build them much nicer than even the pro AC Delco alternators.
Also, Powermaster starters and alternators: years down the road and they need rebuilding, you send then back tk them and they rebuild it to real- new spec. The couple times they weren’t able to rebuild them, they gave new units at rebuild price.
I have a powermaster starter, and when my alternator goes, no guessing what alternator it will get.
Some folks (myself included) would get swayed by lifetime warranty on the cheap auto stores- until I learned the difference. You’ll get massive longer life out of the better built units.