I took the old, original one with the generator to the generator shop here in Everett, WA for them to repair and synchronize the units. Since the old regulator was bad, they replaced with a brand new one. I took the old Delco-Remy cover off the old one, cleaned it up and painted it, and it fits perfectly on the new one. I didn't get the part number or manufacturer but this was only a year ago, so it should be no trouble to get. I do know that it was not expensive and since our cars are probably not the only ones to use them, that is the reason they are readily available.