The made 3 or 4 varients of the front skirt and 2 or 3 for the rear valance...
They made 1 for the escort rst 88spec front, 1 for the 90spec, 1 for the orion early bumpers and 1 for the later orion bumpers, they all look the same they just fit the bumpers differently and can be made to fit each diff bumper with relatively light mods. From memory the 90spec rst and orion fronts are the same, but not 100%.
They made 1 rear for the escort and 1 or 2 for the orion early and latter rear bumpers.

I think it works really well on the makaveli's car above, some cars seem to suit the deeper bumpers others don't... Keep your eye out on ebay if you're after 1, if not give me a pm as i may have a spare front 90spec.