So I'm wondering if the rear cab wall ever had any trim on it. Mine never came with it. I'm looking to dynamat and carpet up the back wall to just below the rear window where it bumps out. Some factory like plastic trim right there would give it a good finished look. It doesn't seem like any reproduction companies sell anything relating to rear cab trim. Was there ever any trim back there? Anyone have any pictures? Or ideas on how to make the transition from carpet to cab wall smooth?
Pic of what I'm dealing with:

Pic of what I'm dealing with: