This is a genuine mountfield blade boss p n 122465618 0 or 22465618 0 suitable for the following models mountfield 483r 292505043 mor 483r es 292505543 mor 553r 292555043 mor 553r es 292555543 mor m40pd 292502023 cal m41hp 292501043 mo7 m43pd 292502143 mo7 m44hp 292501043 um8 m44pd rm55 ohv 160cc 292502043 um8 m480r es 292505523 um8 m484r rm55 ohv 160cc 292505043 um8 m484r es rm55 es ohv 160cc 292505543 um9 m550r es 292555523 um8 m554r rm55 ohv 160cc 292555043 um8 m554r es rm55 es ohv 160cc 292555543 um9 m60pd es 292552523 um8 m61pd 292552043 mo7 292552043 um8 m62pd 292552033 cal m63pd 292552143 mo7 m63pd es 292552543 mo7 m64pd rm55 ohv 160cc 292552143 um8 m64pd es rm55 es ohv 160cc 292552543 um9 sp550 12 9686 00 sp550 tri cut 12 9686 98 12 9686 99 292552023 bq sp554 292552048 bq castelgarden tu504tr tu504tr roller tu454 tu504 if you are unsure whether this is the correct part for your machine, please fill out our online parts enquiry form here'. '.strtoupper('t')he technical department will then respond to confirm whether or not it is the correct part for your machine.