Sorry about the long list repeated, I should have just did the lower section where it says what letter is what....
Interesting thing about the Softails, They have FX And FL designators. I am guessing that referes to the front fork. All the FX's have front forks like they Dynas, (not sure what it's called, "Inverted?" and exposed tubes.
The FL versions Fat Boys, Heritige's, Softail Deluxe.... all have the enclosed style that you see on the tourers....
Ok, well maybe not, the Springers all have the FL designator too!