the later Roadlgides,they changed the angle of the fairing by 2 degrees so that vented lowers would fit.I believe the fairing was tipped forward more.
so if you plan to set it up like a late model,you'll need the late model brackets.
others here will be able to tell you the exact year,but the last part of the part # usually tells you the year the part came out.
2012 FLTRU-Thunderheader,T-max,tuned induction,progressive monotubes
2002 FXD-T-header+too many mods to list