Stupid Question About 69 B Body Vent Window Assembly

I've got a question about the vent window assembly for a 69 Road Runner/B body. If you look at the attached picture at the left at the very bottom of the channel for the door glass there is metal bracket that comes off of the channel that has a round hole. I've seen about 50% of the vent window assemblies that have this bracket and 50% that don't. What is it for? Is the piece just missing on some of the assemblies that I've seen or do some cars just not have them?

I'd appreciate if someone could clear this up for me. Thank you!

Its a support as there is a long rod with a threaded part and a nut that holds it secure to the lower part of the door frame. Prevents the vent window frame work from rattling / flexing when you hit a bump or shut the door. A lot of times the very small spot welds break off on the bracket.

Yes, if you look at the vent windows on my car you'll see that 50% have the bracket and 50% don't (one's broken off).

It also has foam wrapped around the stud that attaches from the bottom of the door to keep it from rattling. And yes it is common for them to break and need re-attached to the vent frame.

Here is a pic of the hardware

It is almost impossible to re weld the original welds and not interupt the window channel flow. I always re-weld them on the outside.

Here is a pic of the stud that slides into the bracket and as said it has a piece of foam to keep it from making noise.

Quote:

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It is almost impossible to re weld the original welds and not interupt the window channel flow. I always re-weld them on the outside.

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Great idea...