Hy GarlandFarms, I believe the o.e.m. p/ns for the pull back springs are: short spring p/n 3694516, long spring p/n 3694799. Neither of those p/ns crossed at the Napa website. Napa now uses the old United brake part numbers for their numbers by adding "UP" to the front of the United part number, I tried United p/n 80166 at the Napa site and turned up nothing. United p/n 80166 is the correct part number for the spring set for your truck four of each spring are required. I tried crossing Raybestos H9226 at both Napa and RockAuto and turned up nothing. It seems this particular spring set is not being reproduced either because of the age of the truck or the short span of their use. There is a member here 54 3600 I believe it is, if he sees this he will probably check for the old O.E.M. part numbers at dealerships. Good luck in your search.
