‘69 Dodge Dart Bench Removal?

Have you removed the nuts/ fasterners underneatrh? There are four. What I did was remove the seat backs, which makes it smaller and lighter, then just pull the seat out the pass side. You may need to put some scrap plywood/ blanket down for "padding" rotate it "on edge" to get it out IF IT is a 4 door.

You have a factory service manual? If no, go to MyMopar and download one for free. You may have to settle for Plymouth vs. Dodge