thanks for suggestion but been looking e bay 12 months - wanted ad Boats & outboards 6 months, ads on here 3x - no joy I think because the size I want would be on perhaps a 23ft boat normally and not very many boats of that size.Lots of bigger sails or smaller about.
Having been in your situation, I have a suggestion: Buy the best one bigger, and have a sailmaker cut it to the dimensions you want.
Not cheap, but a whole lot cheaper than a new sail, and you will have what you need instead of an approximation which might never set quite the way it should.