The original is 17' 10". The sail is 14.33 on the luff. The original main that came with that mast was 15 foot. That mast was a replacement for a wooden original on the dinghy I believe. If I decided to, I could cut this one to close to the original mast length I think. I am not sure how far up the slot starts. The specs give 24 inches to the gooseneck position I think.
I just taped the mast I am considering using. It is 19 foot three inches. The fore stay attaches at 14feet 11inches. I could take about 6 inches off the bottom and still keep a stock boom clearance with the gooseneck most of the way down.
If I don't locate a more likely suspect by the time the boat is fully repaired and ready to go, I think I have to give it a try. I did mention that there was gonna be a big fat feller sailing it didn't I???