LOWER DOOR HINGE STOP PIN. GM 14030534 Lower door hinge stop pin has been modified for length to fit the body-side lower door hinge of 1982-92 F-Body (Camaro and Firebird). This is the large diameter pin that the lower detent pin and bushing are pressed into. If yours is damaged or becomes damaged when you remove your old detent pin and roller, then this is the pin you'll need to fix the lower hinge. It is recommended that the bottom of the pin is welded to the hinge after you have pressed it into the body of the hinge. 

Note: if you wish to save yourself the time and labor of repairing your old lower hinge, then you should buy the body-half or the lower hinge, (which includes this item along with the lower detent pin and roller). Order either TDS 517201 (82-92 Camaro/Firebird body-side lower hinge LH) or TDS 516201 (82-92 Camaro/Firebird body-side lower hinge RH).

Related items to consider: 

TDS 201080 Lower hinge pin and bushings

TDS 606160 GM lower detent pin and roller

TDS 200370 Upper hinge repair kit (non-greasable)

TDS 201370 Upper hinge repair kit (greasable)

TDS 301120 GM door spring tool