Heres a pic of mine on a 318. Pretty easy to install.
Switch out rockshaft, mount the 2 lower brackets, pin the rest together.
Matt, that'll mount as you stated earlier, swap rockshaft, add brackets, and assemble. I was incorrect about rear outlets, they're only for earlier closed frame tractors. Bob
'80 317 w/18hp B&S and divert valve for rear hydraulics, 3 pt hitch, 5' york rake
'82 314 w/rear PTO for tiller
54 4 way blade
Mod 48 deck & Mod 462 TracVac