S&S, cylinder base gasket. Large cylinder 3-5/8". 0.018"

50th Anniversary 2007 Bad Boy 1995–1997 Disc Glide 1986 Dyna Glide Custom 1992 Dyna Glide Daytona 1992 Dyna Glide Sturgis 1991 Dyna Low Rider 1993–1998 Dyna Super Glide 1995–1998 Dyna Super Glide Convertible 1995–1998 Dyna Wide Glide 1993–1998 Electra Glide 1984–1988 Electra Glide Classic 1984–1998 Electra Glide Sport 1984–1994 Electra Glide Standard 1984–1998 Electra Glide Ultra Classic 1991–1998 Electra Glide Ultra Classic Special Anniversary Edition 1995 Fat Bob 1985 Fat Boy 1990–1999 Forty-Eight 2010–2017 Heritage Softail 1986–1990 Heritage Softail Classic 1988–1999 Heritage Softail Special/Nostalgia 1993–1996 Heritage Softail Springer 1997–1999 Iron 2009–2017 Low 2005–2011 Low Glide 1984–1985 Low Glide Custom 1985–1987 Low Rider 1984–1992 Low Rider Convertible 1987–1993 Low Rider Custom 1988–1994 Low Rider Sport Edition (Fxrsl) 1986–1993 Nightster 2007–2012 Road Glide 1998 Road King 1993–1998 Road King Classic 1998 Roadster 2002–2017 Seventy-Two 2012–2016 Softail 1985–1999 Softail Custom 1987–1999 Softail EVO 1985 Softail Night Train 1999 Softail Springer 1988–1999 Sport 1996–2003 Sport Glide 1984–1992 Sport Glide Police 1984–1989 Sportster 1988–2009 Sportster 53 Custom 1998–2003 Sportster Custom 1996–2020 Sportster Custom 110th Anniversary 2013 Sportster Custom LE A 2014–2016 Sportster Custom LE B 2014–2017 Sportster Deluxe 1988–1995 Sportster Forty-Eight 2018–2022 Sportster Forty-Eight Anniversary (ANX) 2018 Sportster Forty-Eight Special 2018–2020 Sportster Hugger 1988–1995 Sportster Iron 2018–2022 Sportster Roadster 2018–2020 Sportster SuperLow 2018–2020 Sturgis 1991 Super Glide 1985–1994 Super Glide II 1984 Super Low 2011–2017 Wide Glide 1984–1986