You may already have this information from droptopford, but what I used when I detailed the trunk on my 57 was the same material that is used as underlayment for roof shingles, which is a felt/tar composition material. You can purchase this from some suppliers pre-cut to fit your trunk lid, but I simply purchased a roll of the tar paper from a lumber store and cut it with a razor knife to fit the areas shown in the photo. I used a combination of contact cement and double stick carpet tape to secure it and so far (about 2 years) it has held up just fine. It does dress up the area quite a bit and looks much like the original factory sound deadening material.
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