Rear seat belt upper mounting points

[hannu_911]

Is anybody able to tell me what is the distance between the following seat belt mounting points in Carrera/964/993. Length A and lenght B?
Thanks in advance.

Why I need this information?
I need to install the 3-point rear seat belts to my 911 SC. My car does not have the upper mounting points so I need to make them.
I need to know the exact locations of the mounting points so that the new rear panel will fit. That will come most likely from a 964 so the mounting points locations on a 964 are the ones that I'm interested in. Although they are probably the same for Carrera/964/993.