"I decided to wait until I get my spinner backing plate for the new two blade Sensenich prop before finalizing the canopy cutoff. It appears that there might be TWO SEPARATE backing plates, with a different setback for the spinner. Using the wrong dimensions might result in a ruined canopy, or at least one that would have to have maybe 3/8 of an inch added to the rear. Not wanting to do that, I am waiting on my spinner to make sure I do it right the first time! I am also waiting for the coolant tank elimination tubing as well, but that is a different story."