These Yukon replacement diff covers are a direct bolt-on.Additional Attributes:GTIN:00883584323440Material:SteelRing Gear Bolt Quantity:10California Proposition 65:NoCarrier Main Cap Support:noCover Bolt Hole Quantity:12Filler Plug Included:noGasket Or Seal Included:noExtended Information:Emissions :CARB EligibleLife Cycle Status:Available To OrderPackaging:Quantity of Each:1.0Package UOM:EADimension:12.0000 x 12.0000 x 3.0000 inchesWeight:4.1000 PG