I550 Questions

So I just picked up this boat from a guy who got it from a guy who got it from a guy, I have a couple of issues other than the transom rot.
 It has no main sail  I looked up the foot and I come up with 8 or 9 foot and my boom is right 8' 5" long not sure if it's the right boom the main sheet mounts don't line up with the  traveler.

The Prindle 15  Catamaran main will fit and for sale by me but will it work?
 I don't want to spend a lot of money on this does anyone know of other main sails that would fit?
 The name on the boat was wild child I don't have a hull number but it's from South East Michigan does anyone knows the previous owner?