Mercruiser Dry Joint Riser Kit, 6 inch | Barr MC-20-864908A1 Barr Mercruiser Dry Joint Riser Kit, 6 inch | Barr MC-20-864908A1 Direct replacement 6-inch spacer kit. Replaces MerCruiser part # 864908A1. Kit includes a pair of spacers, mounting hardware, and gaskets for raw water-cooled applications. Need to purchase additional block off gaskets for closed cooled applications Barr Mercruiser 6 in. riser extension kit Helps to reduce the potential of water backing up into the engine through the exhaust piping Sold as a pair Includes mounting hardware and gaskets for raw water cooling Additional block off gaskets required for closed cooling applications Bolts included can only be used with 14-degree risers Can be used with 7-degree risers but attaching bolts must be reused Replaces Mercury 864908A1 Kit includes: 2 - 6" Spacers, 2 - Restricted Gaskets, 2 - Full Flow Gaskets, 8 - (.375-16 x 7.50) Bolts, 8 - (.375-16 x 1.00) Bolts, 8 - (.375-16) Washers, 6 - (.250-20 x .625) Hex Screw, 2 - (.250-20 x .375) Hex Screw, 4 - Pipe Plugs, 2 - Bracket