Sierra 18-072x Dry-Joint Gasket for MerCruiser Replacement Restricted Dry Joint Gasket for Mercruiser Part Number 27-864850A02, 27-864850A01 Use with: MANIFOLD-Sierra Part Number 18-1843 and RISER-Sierra Part Number 18-1845 Fits: 4.3L, 5.0L, 5.7L, 6.2L utilizing the Dry Joint Manifold and Riser All Sierra parts qualify for and are covered under Sierra's Industry Leading Customer Satisfaction Warranty Before Ordering, Please Verify this is the Correct Part for your Application. For Assistance, Please Call Sierra's Tech Support at 1-877-663-8396