Exhaust Riser Mounting Kit | Barr Marine OMC-20-913784PIncludes gasket & mounting hardware for Volvo Penta & OMC 7.8 in. tall exhaust riser. Barr exhaust riser mounting kit Fits Volvo Penta and OMC 7.8 in. tall exhaust risers For installing 913784, 3863061, and 3857944 risers Includes gasket, studs, and washers for installing 1 riser