Before you start searching for even the smallest part for your mini vehicle, first of all you will need to get hold of its serial number, although this is easy enough to do.
All you need to do is take a quick look at your registration certificate to find all the information you will need. Section D.1 of this document will show you your vehicles make and section D.3 gives the model.
The serial number is clearly shown in the box on the front of the registration certificate.