When I needed a belt for my Feb-14 4/4 with the 1.6 Sigma engine, BHM supplied a Gates 6PK1203 belt which fitted perfectly.
Do you get a squeal on start up that goes away very quickly? If so, it may be that all you need is the belt.
If you need the tensioner unit, have you tried Burton Power ?
Also, Ford have an eBay shop for parts.
