I decided that I will make a pattern a kind of a "mechanical drawing" with dimensions and I'll post it here when it is done. I have seen this same kind of cardboard on other 911 parts in the past, I havnt figured out where yet but when I do I'll post it on this thread too. It does look like the same material as the 69-73 curved cardboard that covers the two fuse boxes in the front trunk, that piece is silver and this one is charcoal gray/black.