You can also use an old-style screen door spring. Just pull it through until you feel the spring in that area of the bend. You'll only need one spring per side. Cut it in half and tie your pull cord to the already formed ends. Hint: you need this at both of the curves. Measure and connect the two spring pieces with cord so that when you pull one through, the other will follow it and be at the right place. Coat it with Ru-Glyde or Armor All...something like that. If your seal pieces are made of rubber or neoprene (including neoprene blends and same-family variants) do not use Vaseline. It will cause these to deteriorate pretty rapidly.

~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end