Unfortunately as your truck gets older sourcing parts will get harder and harder, you will probably never again be able to go one stop shopping for even simple repairs.
My wife recently bought ( without my intervention or input) her first classic car by herself, all previous classics were normally bought and maintained by me, but this vehicle is a 1959 Chrysler Windsor thats rated at 96% original, she's quickly finding even a simple tune-up requires visits to numerous parts suppliers to not only find required parts, but parts that are consideted acceptable OEM.
My wife recently bought ( without my intervention or input) her first classic car by herself, all previous classics were normally bought and maintained by me, but this vehicle is a 1959 Chrysler Windsor thats rated at 96% original, she's quickly finding even a simple tune-up requires visits to numerous parts suppliers to not only find required parts, but parts that are consideted acceptable OEM.