I recently removed the driver's side airbag to reapir a horn contact that was sticking.
I got spare airbags from a 1974 Buick Electra on eBay. The passenger module is a bit different from mine as the 1974 Buick dash is different but other than that and the transmission shifter, the parts are the same. I was lucky to find these parts in the same color as my car's interior.
Here is some information about the ACRS from the owner's manual