Some time ago someone wanted some dust caps for cortina uprights. This site has some listed might be worth a try http://www.oldpartstore.co.uk/CORTINAMK3PARTSLIST.htm

Worth trying your local Ford dealership too - mine had them in stock at 90p each!

I have used these people and they are pretty good so far for the items i wanted which was two dust caps, two thrust bearing washers and two Serrated/castelated nut retainers for the split pins,

they were all stamped with the ford logo and were genuine parts.