Dave,
The way the Amsoil air filters are designed, the lip of the filter should pinch between the upper and lower portions of the airbox to form the seal. The wire mesh provides structural support out to the edge of the filter, to keep it from buckling under suction. This filter looks to be the same dimensions as the OEM paper filter, so I don't see why there is an issue. The seal on the OEM filter actually fits into the space between the upper and lower air boxes, so it is going to be a tighter fit with the airbox open then the Amsoil filter.
I have a hard time understanding the issue a few folks are having with these filters falling apart prematurely, unless they got a bad batch of polyurethane foam. The Amsoil filter on my 1990 Audi 100 lasted for 10 years/140k miles and as many cleanings before the foam got brittle. Considering I paid $25.00 for it, I was satisified with that ....
Try cleaning them in 8 oz of simple green mixed with 2 gallons of very warm water, then rinse in warm water, gently squeeze out most of the water and blot dry with paper towels. I like to service these in warm weather and let them air dry while I do the rest of the oil change service
Avoid solvent cleaning of any kind ....
TooSlick