Removal can be tricky if they have been riveted on. Screwed on ones are of course easier. I've got a pair of genuine Ford sideskirts minus the front 2 jacking point covers if you want them for £60 posted. Currently in Amparo Blue. For spats I would honestly go for genuine Ford for these too as they are more flexible when fitting, and have more fixing points to attach to the bumper.

Tidy looking Escort though by the way.