All the Sierra/Sapphire Cosworths, Escort Cosworth use the same floor pan, the only diff is that the Sierra's was cut by 3" to fit into the Escort. All suspension items are interchangeable in between all these Cossies. The spring rates Fr/Rr recommended by the manufacturers are different, but if they are adjustable, then it doesn't make much diff does it? Just adjust till you're happy...