Thanks Cap'n! So is it safe to assume that if a plate is costar compatible then it is also cherry compatible? Or is that just the GH60?
No, the cutouts need to be specially cut like that. Typically you'll see one or the other, not both. For example, my KMAC plate only supports Cherry stabilizers.
It does seem like a very easy mod would be take a Cherry compatible plate and cut the Costar notches into it. A little more work going the other way.
Not sure why more custom plates don't have both cutouts like the GH60 though. Maybe extra cost due to processing time?