Ordered several 3614 types for the mower from RA. Fram Pros, Champs and UP. All good but the Ultrapowers, wrong size. With the 51348 number I thought it might be a Wix type but no such luck. Too bad because they appear to be pretty decent other than the efficiency being unknown. Media was about the toughest I've cut out of any filter. If they were the correct size I'd use them even being 10 YO.