Looks like they have improved the pre-wiring at least on some models. Here is the rear vent wiring on our 2016 Forester 2401R MBS:
I have also ordered the FantasticVent fan model 7350 (807350) from their distributor after discussing by phone. Pretty much the same price as they have on Amazon, $245 with free shipping. Boat & RV Accessories 866-204-7049. The mfgr does not sell to retail buyers.
The 7350 has the variable speeds (13), automatic thermostat control, remote, power hood opener and closer, rain sensor, and reversable air flow!
Do I need the putty tape for under the edge AND the Dicor?
Land of 10,000 Lakes
2016 Forester MBS 2401R