Those with the same boat will be slim pickings.And test results of pontoons tend to be all over the place.
Your final selection will depend on your typical load and activities.You will need a working tach and a gps for speed.
If you have a prop; do a lightly loaded test run ,get us your prop size,(usually under the prop nut) wot rpm and gps speed we may be able to help.
If I had to guerss I would start with a 13" as a starting point. It may be too light but you could use it till you decide about a better fit.If we go with a 15
and it turns out to be too much you shouldn't use it extensively.
