First 305 Genoa car wanted

I need a replacement Amiot/Goiot genoa car for a 1988 First 305 to fit 19mm I-track. If anyone has one (or a pair) that they've replaced when upgrading or whatever then I'd be pleased to buy it/them...... I think the same cars were probably used for other Firsts of that era. I'm also missing a track end stop if anyone can help with that.
Thanks.
Phone Bill on 07802 218424