Why would I need a caliper? I have it memorized.
The distance between the two bolts is either 32mm or 40mm
The OD is 19 mm and 3/4" will work.
Why do you need the ID?
The I.D. is around 17mm,Zeda's intake bolt spacing they call it 40 but can actually be 42mm,There is No intake port on any engine that has a 40mm dia or width.
IIRC the opening for the inlet port on the cylinder is an oval shape, but the restriction is where the carb clamps to the spigot of the intake manifold.