Your wish has come true....
There are several variations of the 1968 warranty tags. I don't care to discuss those in open forum, but the valence information is available.
Here is an early front valence. At first I thought these were reproductions, but after I recognized the patterns, I dug this one out of the scrap pile. The valence is two pieces. The upper "shelf" is separate (not shown here)
The back is fiberglass strands, not injection molded like 99% of all production 1968 parts. The factory paperwork refers to these as "hand laid". These were most likely created before the production molds were finished. The mounting points are square blocks, mounted with the same red-orange bonding agent used on the KR plenums. The raw fiberglass has a greenish tint to it.
Here are the other cars I have found with this style valence so far...
Hand laid fiberglass lower valence, 6, 37, 56 (all), 77, 101, 212, 232, 311, 523