You know I'm not sure but I was thinking that's what the underlay is.
Maybe someone else can confirm that.
As far as cardboard. For the GT/CS I assume they are referring to the cardboard protectors. But I also think they are referring to a piece of cardboard (or something a little thicker) that lays over the wheel wells. They kind of make the trunk floor extend the full width of the trunk. I only have one remaining on my car. I don't know how else to describe them.
Here is what the MCA rules are for 67-68 in regards to Battery Tray.
Battery Carrier: With appropriate attaching parts. Heat shield on A/C and big block cars.
For what it's worth here is the info for a 67-68 Shelby - I don't know if it was the same but the text in bold are the differences from above:
Battery Carrier:
Semi-gloss black with appropriate attaching parts
(retaining bolts and nuts natural). Heat shield on A/C and big block cars.
=====================================================
I also just noticed this listed:
Trunk, Weather-strip and Jacking Instructions: Original style mounted on underside of trunk lid. GT/CS and High Country Special jacking instructions may be on trunk lid or drivers wheel well.
Do they mean drivers wheel well as in rear wheel well on driver's side?
Mine is on the Passenger's wheel well - easily could've been misplaced by the same person that put my script backwards on the passenger side though.
