This is the brushroll end cap and also known as a bearing block By Sebo (the one you take off to remove the brush roll) to suit the following Sebo models listed below from your Sebo Main Dealer Genuine Sebo part from an authorised main dealer 
Sebo X1
Sebo X1.1
Sebo X4
Sebo X5 (the cover to the longer brush roller, left hand side when looking from the front)
XP2 and XP3 (Not XP10/20/30)
Sebo G1/G2
Ensign Stealth Models 
Ensign SM1 (Jeyes Ensign)
Ensign SM2 (the cover to the longer brush roller, left hand side when looking from the front of the machine )
All orders sent carriage free in the UK MAINLAND Royal Mail or Parcel Force 
All provided with a Vat invoice