I hadn't thought about the quantity of bikes out there in your size. So I went to ebay thinking "how hard can it be?" Harder than I thought.

However, this 68cm Bob Jackson came up. It might be worth investigating, seeing if the measurements are correct and seeing if it would work for you. You could put your group on it and sell the other stuff.

http://www.ebay.com/itm/Bob-Jackson-...item3cc5afe185

There is also a 68cm Raleigh Super Grand Prix on there as well. But the price is high.