The seal you're refering to is the same the that trucks with add-on sleepers have been using for years. I think the sites listed above will get you what you want.
As for the air ride,...I bolted mine up solid.
With the frame stretched, I found the ride to be just fine,...no need for air ride. Also,...if you were to leave it in,...you will need to plan for some extra clearance above the cab roof to prevent interference with the bottom of the overhang.
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