I'm pleased with my setup. I put the BHAF on it because I'm worried about the AFE filter's filtration capabilities. (We get dust storms where visibility is sometimes less than 60ft. ) The Fram was the only one I could find in the short time I looked. When I said it is a tight fit, I'm talking about the filter opening. I actually had to put a little grease on mine to get it on.
The filter is cylinder-shaped
Diameter is about 8in
It is 9in long
It fills the space nicely, but you may be able to go about an inch longer and 1. 5 in bigger in diameter.
Let me know if you guys come up with anything.
Thanks, Marc