This is a set of 4 brand new Atlas CC3 653403 crankcase vent filter elements. These filters are interchangeably compatible with FB60, FB60B, 2991, C24, and CB17 models. They are vintage parts that have not been used before and are direct replacements for your exhaust and emission systems. The manufacturer part number is CC3 and the OE/OEM part numbers are FA87 and FA88. These high-quality filters are made in the United States and are suitable for various car and truck models.