Do I just cut the seatbelt wires?

72 factory service manual, here:

http://www.forabodiesonly.com/mopar/showthread.php?p=1970088617

However there does not seem to be documentation in the manual

MyMopar tech section:

http://www.mymopar.com/index.php?pid=31

Go to the "Master Tech Service Conference Library

http://www.mymopar.com/mtsc/

"Browse by Topic"

http://www.mymopar.com/index.php?pid=436

The "Radio and Accessories" link

http://www.mymopar.com/index.php?pid=449

and scroll down to 72, there's a pdf

http://www.mymopar.com/downloads/mtsc/294.pdf

and a little movie

[ame="http://www.youtube.com/watch?v=gg0geLWGpWg"]MTSC - 1972, Volume 72-5 1972 Seat Belt Warning System - YouTube[/ame]

I would say that referring to about page 12 and after in the pdf, pulling the relay and buzzer would be what you want. It's "up under the dash" somewhere to the right of the column or starting approx at the 16 minute mark in the movie