Original Dual-Stage Air Filter completely submerged in Filter Oil. The filter is then massaged to ensure all pores are evenly coated with oil, it is then placed in a temperature-controlled room to allow the oil to completely cure. All you have to do is open the bag and install. FITMENT GUIDE FOR 154115 3 PIN HOLES KTM 85 SX 13-17 125 SX/XC 11-15 150 SX/XC 11-15 250 SX 11-16 250 SX-F/XC-F 11-15 350 SX-F/XC-F 11-15 450 SX-F/XC-F 11-15 125-300 EXC/XC-W 12-16 250-500 EXC-F/XCF-W 12-16 450 SMR 12-15 HUSABERG TE 125/250/300 13-14 FE 250/350/450/501 13-14 HUSQVARNA MX TC 85 14-17 TC 125 14-15 TC 250 14-16 FC 250/350/450 14-15 HUSQVARNA ENDURO TE 125/250/300 14-16 FE 250/350/450/501 14-16