Like nomowork, I keep two plugs independently tethered to the transom support. You are really going to like your Gregor.
And let me put in an editorial comment for the local marine supply dealers. We are all interested in the best deal, but that often means getting a part on short notice, ot maybe some expert advice. The local guy won't be there if we don't sopport them with our purchases. If you have one in your area, they will have the right plug.