I'll get and extension out and see what screws they take . What year are your extension are they the deep or shallow trim pieces. Here are the differences also there are fiberglass and metal in both. Send me a picture of the inside of your extension. If I have the screws ? which I probably do in that container you can have them for the stamp. I'll look when I get the picture. The trim pieces in the box are the deep. They are the most common around here.