We are also working on a 2 Door Carolina which was being Manhattanized - Sort of.
When the individual working on this Carolina to make it into a Manhattan (WHY?) He went to one of our KF Vendors for Rear Armrests for his 2 Door that would be correct of a Manhattan.
He was sold armrests for a 4 Door Manhattan, and TWO 4 door Manhattan rear ashtrays to mount on each of the rear seat panels. I would not believe it if I did not have the invoice / receipt.
This ashtray / lighter is what you need for your 4 Dr Manhattan front seat back.
Hope this helps you understand what you are missing!!