95923-08090-09 Flange (8X90) Bolt - Overview. The 95923-08090-09 Flange (8X90) Bolt is a crucial fastener used in Honda marine engine systems, specifically designed to support the cylinder head assembly. This OEM part plays an essential role in securing components, ensuring reliable mechanical connections, and maintaining the integrity of the engine structure. Built to factory specifications, this flange bolt supports the durability and seamless operation of your marine engine by ensuring a tigh