I think i mentioned to you about the 67 you had w the 68 rallye dash frame. Struck me as odd. Ma Mopar still did that stuff up into the late 80s. I have a 1988 daytona shelby z with a factory air bag. They were not standard equipment until 1989. However my 88 a late built car has the wiring serviced in the factory harness, trip sensors, air bag wheel, air bag column, and a sticker on the K frame stating wheels need to be pointed straight ahead before steering wheel removal because of the airbag install. Nothing in my 1988 FWD FSM mentions anything about this, how to take it apart, service it etc.and theres nothing in the wiring schematics for it. There is an after the fact factory service manual suppliment that was printed with about a dozen pages in it for this i believe in late 1988, early 1989.
I bet the 68 rallye dash in the 67 was because it was a late built car. They ran out of the 67 stampings and went with it as part of the changeover to the 68 model.
I have seen rallye dashes in plain jane 68 valiants too. There was a strike at the factory making the standard dash, so to keep the assy line moving they stuck rallye dashes in valiants. Came out with a service manual suppliment to address this change to some valiants.