About this item O-Ring Kit Part Number: 217-1588 Compatible with select GM vehicle models and other brands that call for the 217-1588 o-ring kit (see description for compatible brands). Compatible with Silverado 1500, Sierra 1500, Suburban, Hummer H2 H3 2000-2009, and more. Check your vehicles service manual or parts diagrams to confirm that you are looking for 217-1588 to confirm this is the correct size/part. Kit contains two o-ring sizes (one brown and one blue), 8 of each size, 16 seals total. Molded from OEM spec high flourine synthetic rubber for long lasting performance and durability. Manufactured and warrantied by Captain O-Ring LLC. Proudly assembled in the USA!