It seems I'm on a roll. I'm updating and replacing things on the 07 AN400, tire issue posted a couple of weeks ago. I decided to replace the air filter with a K&N replaceable. I read all the posts, watched the videos, thought, no problem. Well, after 5 days and about 20 hours, I'm giving up. I removed all the rough spots, even heated the thing in the oven, it simply will not fit. I can get the forward screw to line up, but there is a 3/8 inch gap on the other. Does anyone know of a good source for original air filters.