Perhaps I've not been paying attention, I've never seen this panal before. An air conditioning blank-off plate? Would this suggest Buick/GM/Fisher built non AC bodys with AC firewalls then capped them off? Possibly inventory or vender shortages, dealer installed AC?
I've seen heater blank off plates but never this. Is this a common occurrence? Anyone else see this before?
Or, could it be that little known secretive Buick cold air induction system, porting/routing cooler air from the high pressure cowl area directly to the air cleaner; similar to the Chevelle and Camaro?
Amazing, 53 years later and still so many questions.