Sorry, I wasn't being clear on that. There's an alt/starter shop in cali making these things. I don't know the details, but from the looks it's a Hyundai elantra alternator case modified to fit the g54b along with a starion pulley. Internals are maybe elantra with a mitsu voltage regulator or something.

Its home brew, so you can only get it from them or make your own.

88 Montero, StarQuest turbo, Kormex 5speed +tuff-pan w/phoenix f. stage2 clutch, 4in lift+33' tires, 4.875 lsd, short-throw shifter, Aisin hubs, SR big brakes, gen2 uca's, elantra alt, and so much more... 16g turbo w/hardpipes + 4.90 locking disk-brake axle soon (maybe lsd or aussie front??)