[stownsen914]

Patssle,

I went through something similar last year. You've got several different kinds of air cleaner housings there. It looks like the ones labeled A in your picture are the PMO non-rainhat style. (Edit -- Actually I see that the housing tops are secured to the bases with springs, which would not be PMO. Not sure what brand they are.) I see the K&N aluminum style ones on the right side of your picture. Though similar in style, the PMO and K&N ones are slightly differently sizes and from what I could tell, use a slightly different diameter filter element. I found that the K&N filters for the PMO housings were a little bigger than the filters for the K&N housings. (Edit -- even if the A ones aren't PMO, they might use different size filter elements than the K&N housings.)

The housings labeled B look like the bases for a stock air filter housing, which is completely different from the K&N style housings.

Scott