Not finding 10" drum spring for 67 GTS

In my 65 Dart w/ 10" drums ~4 yrs ago, I bought a hardware kit for a ~74 Dart from Autozone. It has the improved self-adjuster shown in post# 12. rockauto should have plenty of choices. I think such Bendix-style drum brakes are common across manufacturers, so a similar year Ford Mustang may use the same/similar hardware kit, as per one post, and you can get all parts for an old Rustang. BTW, I had to re-use my old shoe pins since the 1974 shoes are wider, otherwise everything fit. I recall I also had to press in the loose stud that comes in the shoe kit for the tensioner spring, or maybe vice-versa.