Ah yes! For jeeps and tractors that see a lot of rough terrain.

I couldn't find a picture of the GMC air cleaner.
Attached is a picture of a 50 GMC Zenith carburetor and a over-the-counter generic "V" clamp.
So, does the air cleaner base have "V" fingers than fit inside a "V" clamp?
Attachments
V-Band Clamp.jpg (55.68 KB, 103 downloads)

"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."