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I'm looking to trade my 2016 model x - 75D- 6 Seater (White exterior, black interior, Enhance AP&FSD, Ceramic Pro coating, Xpel clear bra, tinted windows) for a 7 seater that has the folding 2nd row.
+1 sell it and buy the 7 seater. The folding 2nd row is a feature that was introduced with newer models, so you'd likely have to pay quite a bit on top to get one of them.