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@gbj_tester
Tacx belt:
http://www.parker-international.co.uk/13261/Tacx-T1043-Roller-Drive-Belt.html
Might need an idler to take up the slack on small rollers as it's designed for 4"+ rollers
Z76 belt is around the length you'd need, again some kind of tensioner/idler would be needed to accommodate the variable roller separation:
http://simplybearings.co.uk/shop/p517064/Z76+Major+Brand+Z-Section+V-Belt/product_info.html