Went to close the door today on the 2001 Blazer and heard a weird noise of something falling off. Opened the door back up (drivers side) and this piece in the pictures fell out.
Can't figure out where it goes and where I should replace it.
Sorry if this is not the right section to post this, I wasn't allowed to post in the technical category.

Any help with an ID on what this part from the door is would be really appreciated!

 

That looks to be the roller for the detent thing on the door hinge that allows the door to stay open in two different positions. Does your door swing freely or do you have the two positions that kind of catch to hold the door?

 

AJBert has it right. Roller for the hold open, detente thingy, whatever it's called. Bearings wear out and sometimes falls out. My door was making 2 popping sounds when open/close when I replaced it. And it's not as easy as replacing the other pins. Door will work without it but on a slope or hard wind you can bust a shin or hit another car door when it flies open or closed. Here's a pic of new one before i pounded it in.

 

AJBert - You are right, the door is now swinging freely, so that is it for sure.
steveduns - any chance you have that picture a little bigger? I can kinda make it out, but it is tiny.

Thanks for the input! At least I know the door isn't going to fall off yet and know what to order!