Robert-
I bought the X version, which is a little bit heavier and not much more money. The regular version seemed to be for smaller boats. I suspect that either will work.
The installation instructions are a little confusing. One suggested set up is to run the conrol line athwartships, perpendicular to the centerline, although the printed instructions are confusingly worded and that installation is not clearly illustrated. It also takes up a lot of space in the cockpit.
The recommended installation is to run the control line aft to corners of the cockpit. For boats like the Ensign with a rudder post visible in the cockpit, Wavefront recommends mounting a turning block level with the top of the rudder post. I did not want a block flopping back and forth on the cockpit wall, so I used fixed sheave Harken 243 microblock, with the bitter end of the control line secured by an angled horn cleat next to the helm station.A cam cleat would be perfect but I did not want to spend the money. Maybe next year.

I used the top of the rudder post as a guide for block placement and mounted the cleat so that the line stays level with the bottom horn of the cleat. By letting the rudder post and line level guide the installation, there was not a lot of measuring needed to keep the installation symetrical on each side of the boat.
I mounted each block two finger widths from the back wall of the cockpit, eyeballed the height from the rudder post and then let the bitter end of the control line tell me where the base of the cleat went. The only measurement was setting the angle of the second cleat so that it matched the first cleat that I installed. The whole project took less than 30 minutes working carefully.

The sheeting angle appears extreme with the tiller cocked up, but in use with the tiller down, this installation actually keeps the tiller from riding up. At the dock, I keep the raised tiller lashed to the backstay and relieve the tension significantly on the control line so that it doesn't chafe in the sheave..
Yes, the line run to the cockpit corner adds an obstacle to tending the outboard, but the control line is easily untensioned and lays flat. As I get used to living with this installation, I likely will uncleat the line on the motor side entirely when I need to climb onto the rear deck.
Stan Murphy
Nana 1658
Hartfield, Virginia