Re-check the numbers. On a canoe, you'd have two chances to get the right s/n, but doesn't sound like that's the case with your boat. Occasionally, someone will chop off the end of a canoe, but they wouldn't add sponsons, so we don't have the record that fits your boat.
I can look at the records--- sometimes "1" is a "7" or "3" is an "8", but if you can check it again on your end, we may save time.
Kathy