If you're insistant on buying new parts, then either check the for sale section on here, or ebay can be your best friend for bargains when you've got an old ford.

Starter : http://cgi.ebay.co.uk/FORD-ESCORT-MK...item3ef798d8e0

Lead : http://cgi.ebay.co.uk/Escort-Mk4-RS-...item35a4d89cf2

But i'd try the above method if you aint got money to blow on your car. If the above method dont work, then I'd consider new parts...