Looking at the exploded view, the front suspension is Jaguar XJS so the XJS shocks should fit right in. I'm sure the Jag units are way cheaper so it might be worth taking one off and going down to your local parts place.
When you put the new one on do not tighten the top mounting nut until the car is back on the ground. This way the shock bushing is not pre-loaded and you won't over stretch it.
When you put the new one on do not tighten the top mounting nut until the car is back on the ground. This way the shock bushing is not pre-loaded and you won't over stretch it.