[NuBomb]

Since the blazers and trucks share so many parts you can check with vendors on this board. I have only bought parts once and it was through LMC (Before I knew about this board). I just bought some heater core seals, and had no problems. The next time I get parts I'm going through some of the folks who are on the board. Kingparts, Christian, GMC Paul, ... LMC was o.k., but you won't talk to anybody who knows anything about our trucks (just operators who take the order).
As far as parts that are not reproduced I guess the lip on top of the tailgate to stop the hatch. The seals on the sides for the tailgate. The plastic caps on top of doors above the vent windows. The seat hold down clamps and brackets. Spare tire holders (interior and exterior). Oh ya, the ever searched for tow hooks. Can't think of anything else, but I'm sure others will.