I am going to say 95 through 97. I cant remember when they raised the seat backs up. Look under the rub rail on the right side if you are standing behind the boat. Should be the last 2 numbers in the set. It will be about 1/2″ to 1″ below it. Take a pencil and paper and hold the paper on it and rub the pencil across it and it will show up on the paper. Also, if it hasnt fallen off look at the front of the trailer and there should be a sticker by the spare tire of when the trailer was made.Last edited by Joey on October 27th, 2010, 5:34 pm, edited 1 time in total.