Probably easiest way to is if someone has a Skunk2 manifold not installed they could zero out their calipers on the ID of a bolt hole then measure the farthest distances between the 2 holes similar to picture below (zeroing the calipers on the hole ID will give you the center to center distance between the 2 holes).

I'm continuing the work of Ethan Vermillion on YouTube for his CBR1000RR ITB intake manifold but his offset pattern seems an odd number and he was ballparking off a gasket.

Wanting to make the ITB manifold work on both NA8 and NB motors (because I'd rather cook my 145k mile old NA8 motor before my 40k mile old JDM BP6D).