The one top left is very rare and if you have one, hold on to it. The optional link is the one that's the most popular. I have a bunch of those. Now and then, the air with copper mesh type comes on E-bay and they go for quite a bit. When they do come up, you will probably be bidding against me. I have this inherent problem with putting oil in an air cleaner, so I 'upgrade' my trucks to AIR cleaners. Not that its the best or anything, just that its the most manageable for me.
