Twin Air 154112DC Dust Cover Fits: KTM 85 SX/XC 04-12, 105 SX/XC 04-10, 125 all 98-03, 250 all 98-03, 250 All 04-07 exc. SX, 250 XC-F/XCF-W 08-09, 300/380 All 98-03, 450 EXC/XC 03-07 Fit this over your Twin Air filter when your riding in severe conditions such as heavy dust and sand This coarse foam pre-filter will act as an additional layer of protection; fits: KTM 450 SX 03-06, 450/560 SMR 08-10, 525 LC-4 (1 and 3 holes) 03-06, 530 EXC 06-07, 625/660SMC 08-10 + more Extends the service time between filter cleanings Designed for use with Twin Air air filters