Re: rear air switch??
There should be a short stalk coming out of the switch assembly. I believe the knob is the same as the ones that are used on the factory radio (it just slips on over the stalk), but you might be able to use a wiper switch knob too. The headlight switch knob has a stalk built into it, so it's different.
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'72 Chevy Suburban Custom Deluxe 10, 402/TH400
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