About a month ago i found these at a local yard.
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I think they were on a 77 or 78 don't remember now, I 'm guessing they are for 4x10 speakers?
Anybody ever came across something like this before?

 

Have come across 'em but not in a Dentside.

Kenwood, Retrosound, and Kicker still make 4x10s which are available through Crutchfield:

4x10 speakers at Crutchfield.com

 

What do they generally come in?

 

Late 80s and early 90s GM products and.... Saabs. I've seen'em as a mono dash speaker too.

What'd ya pull them panels out of??

 

It was a truck, they were mounted in the corners behind the seat.