Why do you want to install a cut off prop, Pierre?
Further opinion?
You will not want to purchase a propeller that has been cut off. You want one that is the full 69 inches. You will not believe the loss in performance with a cut off prop. I replaced a 67.5 inch, well whittled McCauley for a fully dimensional McCauley 6948 prop. The difference in performance was improved noticeably.
Bill
Grants Pass, Oregon