If you get a zero knobby tire spoked front wheel with the larger disk it will fit, of the top of my head you would be after the ds wheels
Personally I dont know if the 16 fxs are the ds, s or fx shocks on the front, if they are the ds or fx your good to go soon as you get the other set of wheels. I wouldn't put knobbies on the s forks and ride it off road, you could but don't get the front wheel of the ground to much, coming down hard or aggressive riding will, put a whooping on the older 14 fast ace stuff..... I'm sure showa will hold up better even put out of their realm