I am in the process of replacing the side sills of a model u sedan.Each side sill is made up of 4 pieces eace 7/8 of an inch thick for a total thickness of 1-3/4 inches. replacement can be made with a 1 inch and a 3/4 inch piece,1 inch piece must go on bottom.the width at widest point is about 9-1/2 inches.each sill half is made up of 2 pieces (4 total for each sill) joined/glued with a tongue and groove joint.I think the total length is 61 inches.