These Yukon replacement diff covers are a direct bolt-on.Additional Attributes:GTIN:00883584323457Material:SteelGasket Or Seal Included:NoFiller Plug Included:NoRing Gear Bolt Quantity:12California Proposition 65:NoCarrier Main Cap Support:noCover Bolt Hole Quantity:14Finish:blackExtended Information:Emissions :CARB EligibleLife Cycle Status:Available To OrderPackaging:Quantity of Each:1.0Package UOM:EADimension:14.0000 x 14.0000 x 3.0000 inchesWeight:3.0000 PG