Switch question for rear defroster

Just found this thread with some good photos of mounting. I took some photos of the early Barracuda versus late defroster Motors and blower cages. The motors are the same diameter and the mounting flange is the same but the newer motor is 1/4" taller. The bases are a different speaker size and the thickness of the speaker adapter is different with the newer ine being slightly thicker. I also noticed that the blower cage where it mounts to the speaker adapter has a different shaped bolt circle between the two. Here's that link to the other thread: 1965 Barracuda rear defogger