B1 - passar följande modeller yamaha tzr 50 1990-2012, aprilia rx 50 1989-2019, aprilia sx 50 2003-2019, aprilia rs 50 1993-2011, aprilia mx 50 2002-2010, aprilia rs4 50 2011-2016, aprilia tuono 50 2003-2005, aprilia rs 50 replica 1999-2006, aprilia classic 50 1992-2005, derbi senda 50 r 1994-2006, derbi senda 50 r x-race 1998-2011, derbi gpr 50 racing replica 2002-2005, derbi senda 50 sm x-race 2004-2010, derbi gpr 50 nude 2004-2005, derbi gpr 50 racing 2005-2010, derbi senda 50 drd r pro 2001-2015, derbi senda 50 drd r racing 2004-2015, derbi senda 50 drd sm 2000-2011, derbi senda 50 drd sm racing 2005-2015, derbi senda 50 drd sm x-treme 2010-2015, derbi senda 50 drd r x-treme 2000-2015, derbi senda 50 r black devil 2004-2005, derbi senda 50 drd r 2002-2011, derbi fenix 50 1994-2000, derbi senda 50 sm black edition 2003-2008, beta rr 50 enduro sport 2020-2023, beta rr 50 motard 2020-2023, beta rr 50 motard sport 2020-2023, beta rr 50 enduro 2020-2023, beta rr 50 motard track 2020-202