Calibra DTM

I am currently building Tamiya's Opel Calibra DTM(Joest). Can any one tell me where the shoulder belts attach to, on the chassis or rollcage? I have been building allot of rally cars which usually wrap around the back Horizontal bar on the cage. There is no horizontal bar on this cage. Any help is greatly appreciated.

Not so long this picture of the '96 ITC Calibra was posted, could it be that the attachment was the same on the Joest DTM Car?

http://people.freenet.de/raceman.de/calibra/mansell/Bild21.jpg

If you haven't seen it, check out this thread (http://www.automotiveforums.com/vbulletin/showthread.php?t=517130) for some very useful reference pictures.

Hope it helps, and can't wait for a Calibra model from you!

Edit:
Here's another one from that thread
http://people.freenet.de/raceman.de/calibra/wurz/Bild29.jpg