That is one of the reasons I steered away from 67 Darts, I heard that it was impossible to find, but I am running into the same problem for the trunk finish panels on my 68 Dart, I have found some, but for $500 and up.
Thanks for the reply, I always seem to pick the ones that are hard to find parts for but it is worth it in the end. I just sold a 71 Cuda, #match 383 and trust me that wasn't cheap either but it paid off in the end.