I'm going to order an H1/H4 headlight conversion for my Shelby Lancer on eBay. While I'm at it I figured I would get a set for the CSX too. The Lancer uses H4656/H4651...which is easy to find a conversion kit for. The Shadow on the other hand uses an H4666 and I can't find a kit for that. Does the H4656 work for the Shadow too? In other words, are H4656 and H4666 interchangeable?