FIR is manufactured and milled from 6061/T6 aircraft aluminum Lowers oil temperature Higher durability and strength than usual - compared to the original Hard anodized coating Deeper profile for oil capacity Does not fit with cover protector (case is reinforced and thicker than the original) Fits models: Reinforced clutch cover KTM/HUSQ 250F/350F 4T 2012-16 For 4-stroke models KTM EXC/F 250F 2014-16 /350F 2012-16 HUSQVARNA FE 250F/350F 2014-16