I just did this on mine. The bolt wont just pull out but the little plastic washer things just spun off so i could get the bolt out. If it is rusted in or something you may need to replace the whole thing. I think they are only a couple bucks at schucks.
Use a penetr fluid such as PB Blaster Kroil, etc.
As Steve83 writes; The '89-96 Door bolt shown has a replacement bushing. The bolt is designed to be unscrewed from the safety loop or washer, but after being tightened, the hole sometimes shrinks, preventing this.
Watch out for the Dorman HELP brand stuff now....the driver/passenger door striker kit w/ bushings, 38445 are not fffin good..bushing diameter is way off and striker frame is off as well....it will bolt-in, but aligning it for a no-rattle fit is efffin a waste of time and possible damage to passenger or driver. the Dorman HELP tail gate striker bushings pn 38424 are a good fit & the door bushings driver/passenger bushings are incl. in this kit & fit better than the 38445 part!
Source: by miesk5
There is a "captive nut plate" inside the B Pillar; so when unscrewing the bolt w/ a Torx T-50 bit that capt. nut plate won't fall to da pillar bottom
I use painter's tape to outline the top and bottom edge of the striker bolt assy before removing so it will line-up almost perfectly