Finally broke down and bought a Barry Grant Rush Filter to put on top of my Speed Demon. The base of this air cleaner is designed to clear the choke mechanism on the Demon. I had chopped up a couple of bases I had laying around but was just not happy with them. Imagine my surprise when my 14"x3" air cleaner came to me and I can't get the lid of the air cleaner to go over the top of the filter element! It actually measures 14.25-14.375 inches! I can get the thing into the base with some finagling but can't get the top on it. I can get a 14x3 paper element on to the base and the lid and others I have will go on to that. The only problem is the way the base is designed it has a dome rising up in the middle that appears to effectively block the bottom .750 inch of the filter! Anybody else encounter this with the Grant air filter assemblies? Thanks.