[DanTwoLakes]

Here is the sequence of how to sew it together. Sew the long piece and the piece next to the long piece on the right together. Flip that assembly over so it's face up, and then sew the small piece on starting from the end and sewing toward where the long piece curves to the right. If the piece is slightly longer when you get to the end, just trim it off flush.

I didn't cut any relief cuts in the vinyl when I sewed it, but it's perfectly O.K. if you want to do that, just don't cut them too deep. Remember that the vinyl will be stretched onto the seat frame, so any wrinkles should just disappear.

I topstitched both seams so it's easier to see how they should look. The last picture is how the whole thing turned out. Sorry, this is the best I could do without having the pieces to make it exact.