K&N RF-1044 - Round Tapered Universal Air Filter 6 inch Flange 7.5 inch Base 5 inch Top 8 inch Height - CSPRacing
K&N K&N Engine Air Filter: High Performance, Premium, Washable, Replacement Filter: 2005-2015 Mazda L4 (Roadster, MX-5, MX-5 III, MX-5 Miata), 33-2335 in the Automotive Hardware department at Lowes.com
K&N Filters RU-2800 Universal Clamp-On Air Filter (5" ID x 6.5" Base OD x 4.375" Top OD x 7" H)