been a long time since i had a mk3 but it wasnt much, you may be able to pick up a second hand one in working condition. Or there may be a kit with the bishes in so you can refurb it.
Pop on here as they look to be fitting one from a puma which will be easier to source.
http://www.seriesoneturbo.co.uk/show...hlight=linkage
at the very least, the site is very helpfull and all MK3 escort so people will have the bits you need if you replace like for like.