I have never seen a Gen I pump from a yard that worked. Gen II pumps will swap in. They are in the PS fender and above/behind the wheel well liner. That, and their younger age, seems to result in more of them being in good shape.

If you want to save room in your engine bay, you can get the bottle to fit in the Gen I. Took a little fenagling, plus a little heat to reshape the bottle, but I have mine in the DS fender.

Big Truck: 00, 3.5, Endeavor, 5-Spd drive line in hand!
Little Truck: 87, 2.6T I/C, MT, LSDs, Tonneau Top
Her Truck: 03, 3.8, 20th Anniv, 65k
Daughter's: 06 Eclipse, Keeping it Mitsu!
FSMs: MitsubishiLinks.com