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I'm unsure as to if this will fit my stock 73 412. Anyone know?

http://larrysoffroad.com/item512496.ctlg

I just posted this because it's the local (to home) aircooled shop....no affiliation.

Yes, it will. I have a similar one on mine. Mine is Thunderbird. I think it is the same as the EMPI version. This is the best budget exhaust for a Type 4.