This is the Seal Kit for the Lift Cylinder on the wheel lift of the Century Formula 6500 – 600 Series and Holmes 552 / DFT 650 light duty wreckers by Miller Industries. The part number for the lift cylinder is 12-0303065. To see which specific models this seal kit fits please see Features below. To view part schematics click on the Brochure tab. Fits:Century Formula 6500, 600 Series REV AHolmes HP 552 / DFT 650 (09/1994 – Current)Dimensions: 3.5″ L x 3.5″ W x 0.75″ H