I was gonna ask the same question as Stan about the Mahle 94s.....
Last summer I rebuilt the top end of my 2165(78 x 94) Raby type1. New Mahle forged pistons and cylinders went on(after pistons were balanced), and the heads were sent out for guides and valve job.
I used "B" pistons, they are for any increased stroke up to 82mm(I think). They worked great for my 10.1:1 engine for about 35k, I ran them for another 5k miles with ever-increasing blow-by.