have a look at the link.
https://www.thewheelshop.co.uk/space-saver-wheels/skoda
 

Have a look at the thread I started, some very useful replies on the size of wheel required!

Thanks. I'm giving my old one to my eldest (his mk1 VRS is starting to get a bit tired) so I think I'll just keep the spares as they are. I don't have the storage cubby hole on the left in the boot as this has the upgraded Canton sound system so it's got the sub there, having the skinny spare I can put bits and bobs in that space that's left.