Amazon.com: PIAGGIO Air Filter Element Air Filter, Premium, M24-M28 for Aprilia, Derbi, Gilera, 8292580P : Automotive
DNA Filters Aprilia Atlantic 400-500 (01-04) DNA Air Filter P-AP8N09-01 OEM Air Filter Air Flow: 94.00 CFM, DNA Air Filter Air Flow: 116.00 CFM APR-ATL Product Details
MANN C35126 - Air filter cross reference
2003 Aprilia Atlantic 500 Parts & Accessories - RevZilla
Mann C 20 500 air filter used with CF 500 secondary element