Will seats from a newer Challenger fit an A-body Barracuda?

About anything will fit if you are able to make it.
I have BMW 325i seats in my Dart.
The 325i has a totally flat floor, and the Dart sooo doesn’t.:D

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You TOTALLY beat me to that. LOL. Will a 70 Challenger front clip fit on a 68 Barracuda? Sure it will; with a lot of cutting, welding and fab work.