Ash is correct, you need to use the starter from the 1800 cvh engine. They are not easy to find on their own but Lucas LRS707 is the same. I've just ordered a new one for mine from:
http://www.forge-services.co.uk/acatalog/LRS.html
You'll need to grind quite of bit off the Zetec Blacktop sump to fit it unless you are planning on changing the sump anyway, the cvh sump also fits by moving the bolt holes slightly and is easier to shorten being steel rather than ali.
Andy