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THIS UNIT IS A 2 BOLT FLANGE UNIT THAT WILL ACCOMMODATE THE HC BEARING,. THE HC BEARING HAS AN EXTENEDED INNER RING OF BOTH SIDES OF THE OD OF THE BEARING. THE FLANGE UNIT IS THICKER TO ACCOMODATE THE INNER RING EXTENSION ON BOTH THE FRONT AND BACK SIDE OF THE FLANGE UNIT.