Help: Fender sizing

[SuperRSi]

Can one of you guys with the widened Kerscher fenders do some measurements for me? I am running 944T rear arms which confounds Kerscher as they "don't do that" so what I need is a measurement from somewhere on the frame or the flat of the rear torsion housing without the cap. If you can tell me how far out a widened 7cm fender is, I can figure out how wide a fender I need. Please help if you can.

Thanks