Talked with Leif (long A sound) at DDM. Sent him pics of the bulbs I was replacing and he replied within the hour. This is on a 60 series JD combine. Recommended 9006 on the cab roof and 880 on the two lower front lights. Haven't installed them yet. Leif said he had gotten several calls for the kits for farm equipment and was working on getting  the  bulb conversion numbers sorted out. I was a first time buyer but I will say he was very helpful  with my order. I would recomend talking with him about what you might need.