Building from new NDS2 receiver. What, please, is the correct dimension from top of receiver for the semi and auto detents in the receiver?

They are on the arc of the selector travel of course. Just need to know how they are down vertically from top of receiver.

There are variances, apparently, as I followed dims in one of the "how to" books and put the detent about 0.060 too low. Argh!..........

And do AK47 and 74 use same dims for the detents?

Thanks,

Forest