Polaris RZR 800 owners, this Caltric valve seal kit is exactly what you need for engine maintenance or repairs! The set includes 2 valve guide seals and 2 valve spring seals that are compatible with 2009-2010 Polaris RZR 800 and RZR S 800 models. These replace OEM part numbers 5411895 for the guide seals and 5910329 for the spring seals. The dimensions are precise: guide seals measure 0.74\\\ width, 0.98\\\ length with 0.20\\\ inner diameter and 0.55\\\ outer diameter; spring seals are 0.31\\\ width, 1.04\\\ length with 0.44\\\ inner diameter and 0.61\\\ outer diameter. The quality is solid - these seals are designed to withstand engine heat and pressure while preventing oil leaks into combustion chambers. If you're experiencing oil consumption issues, loss of power, or doing a top-end rebuild, replacing these seals is crucial for proper engine performance. Installation requires some mechanical knowledge and proper tools, but for anyone comfortable with engine work, it's a straightforward job. Always compare the old seals with these new ones before installation to ensure perfect match. Keeping your valve seals in good condition helps maintain compression, prevent oil burning, and extend your engine's life. This kit provides everything you need for this specific repair at a much better price than dealership parts. For serious RZR enthusiasts who do their own maintenance, this is an essential replacement part to keep your machine running strong!