Would a Split Bench seat from another model work in a dart?

you can ship a bench through the mail. Might cost a bit but depends how eager you are to get the job done.

I am fixin to ship one real soon so I have the correct year of seat that I want.

They are definitely not all the same ....benches changed almost year by year. many years are similar but there are subtle differences and it depends how picky you are. I am very picky what goes on/in my car so its worth it to me to ship one for a couple hundred bucks and sleep at night knowing I have exactly what I wanted. .....just sayin.