disco 2 seat catch

hi everyone not been on here for a while so bare with me
my brother has a disco 2 51 plate and I've broken the 60 seat latch on top of the seat so now I can't drop it properly . does anyone have a spare seat which is ripped or damaged to get the catch out . these parts are no longer available from the dealers ????? silly but there you go . so can anyone point me in the right direction please

I'm keeping my clothes on thanks very much!