Cunningham Machine Bushings:
https://www.cunninghammachine.com/product/chevrolet-truck-heavy-duty-door-bushings/
Parts:
All parts can be found on Rockauto.
Door Roller Pin: Dorman 38433
Door lock Solenoid: Standard Motor Product DLA8
Door Pins: GM Genuine 88891731
Door Hinge: GM Genuine 19354125
Door Latch: SKP SK940102
Door Striker Washer: LMC 31-2900
Door Striker: Dorman 38428
Door Spring Tool: GM W84603