Just go to an auto body shop supply store and get some 3M double sided trim tape.Stick it on the back of the emblem and just stick it on the tank. It's the same thing H-D uses on the new emblems. I've got the emblems from the 2005 Softail Springer Classic on my 03 Road King Police ( they come w/o any emblems) and they're real close to what yours look like. Probably about $120 from Zanotti's. Just my -2$en#e-
Use H-D adapter kit P/N 61785-92T ($12.95) to install the 61769-40T ($34.95) Nameplates.
They are "36 to "46 tank emblems.
The trim strips are P/N 61798-41T ($28.95) but do not have an adapter kit. May have to use the 3M tape on them.