does any body know of a pannier system i can us with the factory rack on my v7 stone 2014 thanks

I wondered about this myself.

In the end, I came to the conclusion that it was all going to be too much bother; so I bailed out. I have just bought a new rear rack, pannier frames, and panniers from Hepco & Becker.

Result is that I have a rather nice Moto Guzzi chromed rear rack for sale !!

I just got hold of a full touring set for my v2 - the panniers are semi-solid and bolt on to the wire frame. It integrates with the rack that you already have. You have to lift inner bags out of the panniers and leave the panniers on the bike. Looks very smart though.