Checkout Eager they're a small company and I've found them helpful in the past perhap they'd make a one off pair for you:- http://www.ebay.co.uk/itm/Eager-Oversho ... 0644955960 Their sizing is generous,I wear a size smaller than their sizing guide and they go upto size 13 UK.
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"All we are not stares back at what we are"
W H Auden