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I have found a few European trader on the bay who seem to specialise in shoes, cleats and other 70's kit, so I am starting to do some regular searches. I'm sure something will turn up in my size soon.
Do a search for vintage cycling shoes on the bay, and look at what's available in Europe. You may get lucky, as unsurprisingly smaller and bigger sizes seem more plentiful. Watch the prices though, as some of the French and Italian traders seem to think that shoe which did not sell back in the 70's and 80's are now in huge demand, if their prices are anything to go by.