850-120 Master Cylinder Rebuild kits are for the rear cylinders for the following Honda models:

'84-'86 VF500F Interceptor
'87-'90 CBR600F Hurricane
'91-'94 CBR600F2 Hurricane
'88-'91 NT650 Hawk GT
'93-'07 XR650L Dual Sport
'86-'87 VFR700F/F2 Interceptor
'86 VFR750F Interceptor
'90-'97 VFR750F
'02-'06 CB900F
'87-'88 CBR1000F Hurricane
'90-'91 CBR1000F Hurricane
'85-'86 VF1000R
'91-'02 ST1100
'92-'02 ST1100A ABS
'95-'99 VT1100C2 Shadow 1100 ACE
'00-'06 VT1100C2 Shadow Sabre
'98-'02 VT1100C3 Shadow Aero
'99 VT1100D2 Shadow 1100 ACE
'98-'01 VT1100T Shadow 1100 ACE
'04-'06 VTX1300C
'05-'06 VTX1300R
'03-'04 VTX1300S
'05-'06 VTX1300S
'97-'00 GL1500C Valkyrie
'03 GL1500C Valkyrie
'99-'01 GL1500F Valkyrie Interstate
'97-'00 GL1500CT Valkyrie Tourer
'87-'88 TRX250X Fourtrax
'91-'92 TRX250X Fourtrax
'93-'00 TRX300EX Fourtrax 300EX
'01-'04 TRX300EX Sportrax 300EX
'05-'06 TRX300EX Sportrax 300EX
'06 TRX450ER
'04-'06 TRX450R
'92-'97 CR80R
'98-'99 CR80R
'00-'02 CR80R
'96-'97 CR80RB Expert
'98-'99 CR80RB Expert
'00-'02 CR80RB Expert
'03-'07 CR85R
'03-'07 CR85RB
'87-'99 CR125R
'00-'01 CR125R
'87-'99 CR250R
'00-'01 CR250R
'90-'95 XR250R
'96-'99 XR400R
'02-'06 CRF400R
'87-'99 CR500R
'00-'01 CR500R
'91-'00 XR600R
'93-'07 XR650L Dual Sport
'00-'07 XR650R