I am trying to find a replacement voltage regulator for my 1978 FJ40 which was built in October of 1977. It has a solid state voltage regulator made by TRANSPO number IN568. I would like to replace both the alternator (Nippondenso 27020-61013) and the voltage regulator at the same time. I am having a hard time finding a solid state external regulator with the appropriate green plug etc. My research has turned up a Wagner built one (WO95-10) but, upon calling Wagner learned that they have discontinued the part. Any help would be very much appreciated.