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The tech that did the work on my 1998 FB used a HD turn signal mount for an FLST. Cost per side was $34.99 according to the repair ticket.
Also rather than leave the wires dangling or exposed he drilled the Nacelle, installed rubber grommets and feed the wires through for a nice clean look.
I have a very detailed step by step post from a few years back on this. It's called Turn Signal Relocation 101 (with pics). It's also on a 2006 Fatboy.