I tried to nstall 32" version. Outside holes are only 31" apart. That doesn't work on 16" stud centers (unless you think an 1/8" screw on 1/4" edge of a stud is ok) these rails need to be 1" longer so the holes are a full 32"/48"/84" apart. The instructions say the ends and every 16" MUST be in a stud to get maximum rating. Only reason I gave it 2 stars is the rest of the system looks pretty nice, but if you can't mount securely...