You can buy direct from John (at least you could a few years ago) but you can also buy from original parts group.
In post no. 8 in the 2004 thread, Steve gave this as the contact: 563-588-0536. He is also listed in hemmings
OPG website:
https://www.opgi.com/searchpart.asp?...rd=trunk+paint
You can get either gray/white or black/aqua