I checked out the very same thing when the FLD came out. The triple trees are FLD specific, kind of like a Fat Bob tree using 41mm forks. I don't think the mounting holes are anywhere near correct. I would try a 1960-84 FLH headlight nacelle first. It may fit and it is designed for a 30 deg rake which is close enough for the headlight to point correctly.
On another subject, my father just picked up another old FLH (now has 3 Shovelheads). A 1984 (belt final drive) Limited Edition, King of the Highway FLH Electra-Glide. It is in nearly new condition and has all the original parts including an inner fairing with HD radio and speakers. Also has a Police windshield if you want to ride without the fairing and trunk etc.