i was washing my wifes camaro and noticed something ive never seen before... i think it is some guide for the door?

 

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I know this doesn't help a whole lot, but the part in the first picture is called the "door wedge plate" I 'm pretty sure its there to ensure a snug fit between the door and body. There should be silencers (most probably made of a hard rubber) behind the wedge plate to create the right spacing

 

so would it benifit me to put them on my bird if i found some more from a yard or aftermarket?

 

Benefit you? maybe, it'll probably just give you a better fit so the door wouldn't rattle...i'd think.

 

These wedgies are found only on coupes with t-tops and convertibles. I shudder to think they were GM's method of stiffening the chassis!...

 

me too...but yet that seems really flimsy, i don't think GM would do that.

 

Those are GM's answer to the racket coming from the rear of the doors when you hit a bump. Service bulletin was put out about them.

 

I have those too, but my driver side rubber is missing.

Good god....

 

Third Gen F-bodies were before my time, but we put wedges on a lot of doors to control chucking. It is for noise mostly. Makes sense to me on T-tops and convertibles since our doors are a stressed member of the frame.