Good to hear the factory regulator worked on yours Mike. There must be different Denso alternators though. I picked up one off of E-bay that was supposed to be from a 89 Dakota 3.9 and it had 3 connections in addition to the main 10 ga. battery connection. Not sure what the 3rd was for but it didn't look like a ground. I don't doubt the factory brackets fit because they're thin. The March brackets may fit and they may not because they're quite a bit thicker than the factory brackets are. That's the reason I said I didn't think they would fit.