Hi Martin I know you posted 4 months ago but I have just come across it. I am picking up a new Outback Limited next week. I queried with the dealer whether a full size spare ( alloy or steel ) could go in the back and was told it would be an inch too big.
So your comment about a steel wheel is interesting to me. Leeds is not too far away from me. Is the dealer that supplied you with steel wheel and insert KT Green ? I will contact them and enquire. Cheers