Just putting this up for a laugh really. I stumbled across them on eBay, not sure if they've been posted.
Kings KT-115
http://www.ebay.com.au/itm/Kings-Tire-K ... 51c4ce7889
"Kings Tire KT-115 Rear Tire - 225/40-10 (17x8.5x10) KT-115"
They are for turf terrain in 'super soft' compound, for the rear tyres for ATVs. So all in all probably not great (or legal) for a Mini on the road. Still - if you are looking for a way to fill out the guards...
Note the front tyres are 165/70/10

And a cool selection of all manner of tyres:
http://www.kingstire.com.cn/pro.asp?id=138
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