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I made my own out of 3/4" pine. I glued foam to it and wrapped it in black felt. The black felt matches the black rug in my Z06 perfectly.
First get a stiff piece of cardboard and cut it out to the approximate size of the opening. Then put it in place and tape small pieces of cardboard to fill in the gaps. When all of the gaps are filled, take it out and trace it on a piece of pine or MDF and cut it out. I used 3/4x5/16 self stick foam weatherstripping for the edges then spray glued 1/4" foam to the back and face of the board. Fold the felt lengthwise in half and place the board inside the felt. Staple the bottom and one side of the top. Then pull the felt over the stapled top and side pieces and elmers glue it in place using pushpins to hold it until the glue dries.
It might sound like a Rube Goldberg, but you could not tell this wasn't bought from a catalogue. The only thing I'm looking for now is an embroiderd Z06 emblem to put on it. This whole thing cost me about $35. I would post some pictures if I knew how to do it.
From my web page - this is an AutoCAD format drawing of the C5 partition template. You'll need to print it on a large format printer using AutoCAD 2002 or later. I could try and print it for you at work but not sure when I'll get time. I used to print these out years ago and send them to forum members who needed one.