Here is a picture of what I think you are talking about. It came with the car, but I know the previous owner purchased it from someone on this forum. Can't see other side but it is the diamond pattern you are talking about.
I had HKS cone filter in there and finally found modified stock airbox. DON'T use some crappy cone filter unless you need to remove the stock airbox to make room for a big turbo. I left the heatshield in anyways since it seemed to fit w/ airbox in place..
It goes all the way back to the firewall w/ opening for the few lines that are back there, hole in the front for airbox ducting is perfect too.
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