The rusty one that is.

I don't think is part of the "Window Regulator Assembly" because I was just at my jobbers' with the whole panel and the window regulator assembly that I had him order for me didn't come w/the rusty part that you see in the picture.

I hope is not part of the "Window Track Assembly" or worse yet the window glass.

Its off of a 94 Suburban, front pasenger side window

Thanks,
Matt

looks like it has a grove in it, was it at the bottom of the door panel???

Looks like the window track to me .

That's definitely the part of the "Glass assy". That channel is attached to the lower edge of the glass and allows the regulator a contact area with the glass. I wasn't able to obtain "just the channel" and therefore, I purchased a whole used window.

That's definitely the part of the "Glass assy". That channel is attached to the lower edge of the glass and allows the regulator a contact area with the glass. I wasn't able to obtain "just the channel" and therefore, I purchased a whole used window.

Bingo

Yup, GM says is part of the door glass, 280 bucks CDN...

Junk yard, 20 - 50 bucks.

Yep, bottom of window is where that goes. Mine rusted out on my 93 K2500 and had to get the whole glass. Got it from a junkyard....Old window is sitting out in the shed with the rusty channel still on it.