Unmolested 2003 with 30K miles. The driver side door is sagging a bit. It seems to me that it's the hinge pins as they appear worn and I can lift the door and feel slack.
Can't seem to locate replacement pins or references in the forum to this problem. Anybody have a cross-reference? Should I try to adjust the hinges instead?

 

Welcome- are you the original owner of this particular 350Z? Door sag has not been an issue on the Z33. I'm guessing the door or hinges have been damaged in some way...

 

Is it sagging to the point the door does not close properly?

 

Are the bolts on the hinges tight?

 

As Advan points out, some members here have had the door hinge bolts come loose, quite a number of them low mileage cars like yours. (Thanks Nissan assemble line workers.) The bolts holding the hinge to the door are easy to check and get at. The bolts holding the hinge to the body are harder to get to; you may even have to remove the fender. Like most cars the door hinges are adjustable, and you might only have to adjust the door up a smidge to set the world right again. The last adjustment to do is the latch striker to get perfect latching action after you have altered the door position.

 

Bolts were solid up top. Pretty tight, definitely not loose on the bottom. However, after a couple iterations of some cautious loosening with a 12mm wrench and a floor jack for stability (not force), it's making that sweet sounding thunk as it shuts perfecting center on the latch striker.
Thanks all for setting me straight and sending me after the bolts.