They arnt rolled, like previously mentioned, they are cut (rather crudely) at FPV.
If you want a car with a decent sunroof installation, you'll have to go to BMW, Merc etc
1993 ED XR6 M5 (1 of 329)
Turbo on the way!!
1993 EBII Fairmont (Now wrecking, PM if you want any parts)
1988 Nissan R31 Skyline