Here are some part numbers - cut/paste from my conversion thread.
Got my charging system working - with help from some folks on here. Used the alternator (nippondenso) that came with the 1997 cummins engine. Used a regulator from a 1985 Dodge pickup, about $15, Napa part #VR38SB. The V could be a U, hard to tell on the box. Bought a plug to fit the regulator, Napa part #VRC38, about $8.