So as suggested I have the carpeted bit of the rear flooring that covers the spare wheel well.
It's a one peice and will, I'm pretty sure, fit both s1 and s2
It has a vinyl print on the underside, unique stagea "unicorn shoe" (haha)
Sorry about the external link, but I can't get photos up on here.
Looking for $100
http://m.gumtree.com.au/stagea-spare-wheel-cover/v?adId=1010648638#Stagea