I have a 2007 Softail FXST and I'm trying to find a good set of drag pipes for it. My issue is that everytime I find a set I like, they will only fit the heritage/FXSTD/Springer ext models but not the standard FXST. Now as far as I know, its only wheel size and other small things that are different and the exhaust should more or less be universal amongst them but I dont want to buy a set and be out cause they dont fit. So is the exhaust the same on all of them or is it going to be specific after all?