mk 1 top joint moulding required

Hi Folks

Just picked up my MK1 Strida today…finally!! It is pretty good condition considering its age. it is one of the first 7000 made with a serial number of 6824 or thereabouts. I have had a bit of ride on it and it feels good. The only problem is the seat bracket is broken which means that the seat swings a bit. Does anyone know of any where that I can get my hands on a replacement please? Would a new quick release one fit a MK1 at all? Many thanks in advance for anyone`s help

Cheers

Giles the Viking