These Yukon replacement diff covers are a direct bolt-on.Additional Attributes:GTIN:00883584323174Material:SteelGasket Or Seal Included:NoFiller Plug Included:YesRing Gear Bolt Quantity:10California Proposition 65:NoCarrier Main Cap Support:noCover Bolt Hole Quantity:10Finish:RawExtended Information:Emissions :CARB EligibleLife Cycle Status:Available To OrderPackaging:Quantity of Each:1.0Package UOM:EADimension:12.0000 x 12.0000 x 6.0000 inchesWeight:4.8300 PG