I have seen air seats that look like they should fit. The riser with air spring is about 3 or 4" tall when collapsed, so add a few inches for some cushioning, and it should still fit.

I have not seen or figured out if an air ride bench seat is a good idea?

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-