The cylinder gasket is a gasket set designed to enhance the sealing between the cylinder head and the cylinder block.This compensates for the flatness between the cylinder head and the cylinder block.It ensures that the cylinder head and cylinder block do not leak air after installation.This helps maintain proper engine.If the cylinder head gasket is damaged, air leakage can occur during engine.This may result in a compression ratio that does not meet specifications.This can cause difficulty starting the engine.This kit includes 1 x 34955-04 Primary Cover Gasket 1 x 25463-94 Inspection Cover Gasket 1 x 11105 Drain Plug 2 x 11171 Inspection Cover Screw O-Rings 1 x 34986-04 Chain Inspection Cover gasket 3 x O-Rings Fit for XL1200C Sportster 1200 Custom 2004–2019 XL1200C Sportster 1200 Custom 2007–2019 XL1200CX Roadster 2016–2019 XL1200CX Roadster 2016–2020 XL1200L Sportster 1200 Low 2006–2011 XL1200N Nightster 2007–2012 XL1200NS Iron 1200 2018–2020 XL1200R Roadster 2004–2008 XL1200T Super Low Touring 2014–2018 XL1200V Seventy Two 2012–2016 XL1200X Forty Eight 2010–2020 XL1200XS Forty Eight Special 2018–2019 XL50 50th Anniversary Sportster 2007 XL883 Sportster 883 2004–2008 XL883C Sportster 883 Custom 2004–2009 XL883L Sportster 883 Low 2005–2010 XL883L Super Low 2007–2019 XL883N Iron 883 2009–2020 XL883R 883 Roadster 2005–2007