I had the 66 Fairlane on hand, as well as the 67. I didn't have a Thunderbolt, but I've read elsewhere those components will work also, although I can't personally verify that. So much of the 66 Fairlane parts were nearly a drop in fit. Any mods were done to the 64 Comet itself, and almost nothing was modded on the 66 Fairlane parts, beyond what I mentioned in my original post.