I have a Prism w/tractor style seat.
THIS is what I use. It's the best, most comfortable yoke. Solid, easy clamp-on and easy on the shoulders. Slide seat all the way back, then clamp at balance point of pedestal. Holds canoe high above the head for sight clearance. To store when paddling: remove, turn upside down, set it on bottom right against pedestal uprights and secure with bungee cord.
For bench style:
THIS which looks like a modified version of the tractor seat clamp-on. Looks the same but don't know how high it'll place your canoe over your head. No hands-on experience with it.