Have you tried https://parts.autonationfordwhitebearlake.com/? They're a Ford dealer that sells parts at a discount. Way less than your local dealer would sell to you as a walk-in. But parts that old may not be available. Just checked: still available but a bit spendy as they sell the whole belt/retractor assembly.The seat belt in my regular cab 99 Powerstroke stopped retracting and the belt just sort of lays there on the seat. Having one heck of a time trying to find the replacement for it. Any thoughts here?