Atomic GS-11, Race Plate Center Point?

Trying to find the center point of a riser on a Race Stock GS-11.
Looks like the normal GS-11, but with vertical sidewalls, and the plate is a flat, black two-piece plate. I'm trying to put a Sillimon on it, to avoid the weight of an Atomic binder.

I tried using the center between the two plates, but his looks way to far behind. There's no mid-sole mounting location on the ski or on the plate, it's only pre-drilled for the atomic binding.

Also tried putting the Atomic binding on the plate and then marking the appropriate midsole mark, but it still looks to far behind.


Outside of using an Atomic binding anyone have any suggestions?

If you can go to a shop that has the jig for the flat atomic plate and it will give you the exact center point for the binding on the plate. as for the ski, you want to call Atomic's race tech line and they might be able to give a measurement.

Do those black plates have little brass inserts for the binders? I had the same idea on a pair of SG's, but then I took the plate off the ski and looked at it from underneath.... it's hollow in a lot of spots. You can't really just screw another kind of binding to it, if it's the same one I have.
I'd check it out before you proceed further.