83551-376-000 Side Cover Grommet - Overview. The 83551-376-000 Side Cover Grommet is an OEM rubber seal integral to the Honda motorcycle and marine engine systems. This grommet functions as a protective and cushioning component for side covers, preventing water, dust, and debris from entering the engine compartment while absorbing vibrations during engine operation. Its precise design ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features.