99.9% sure all Sierra Mk2 sunroofs are the same across the range. I do remember a thread on here where someone wanted to know if a Saph sunroof could go into a 3DR and there was various comments, some saying there different and someone else saying he had managed to do it with a mod etc and someone else saying it was a straight swap, so in other words MK1 and MK2 may differ.

Martin