Auto parts stores typically have a red help section w/ odd parts such as door hinge pins/bushings and probably the HL adj. screws you're looking for.
I found some/all the parts are Dorman, googled it for you... 42119? If that's what you want they're as close as a parts store.
https://www.google.com/search?q=dorm...utf-8&oe=utf-8