you will probably need FLH fender struts with the correct mounting holes for the saddlebags frames.
Maaaaaaaaybe an FLH rear fender as well... I think it is wider than the FX one, so the struts will fit better.
Should bolt up no problem but may have to drill a 3/8" hole in each of the bag mount brackets to catch the fender rail holes if I remember right and I believe the Wide glides and FLH's had the same width fenders if not the cross over bar that goes between the support brackets at the bottom of the finder may need a bit of tweaking or space the rails out with fender washers it's about 1/4" each side . Went through all this years ago with mine and swap meet parts years ago .
Anything will fit on anything providing you make it work within reason. These bags are smaller than the new FL's but they work well. Keeps the water out if you re-seal it. The hinge system is not the best as the lids rattle.