Re:
Headset is standard Oversized as it was called aka 1-1/8" frame. Internal diameter does not matter, it is whatever the 1-1/8" size spec is.
30.0 seatclamp bands
26.8 front mech
68 shell
This is standard for most all retro konas (steel)
Size for a 1992 is from top of the bottom bracket shell to the top of the seattube, to the nearest inch.
But it doesn't really matter other than to take about it and get the other specs easily.
Seatpost is often 27.0 as per normal kona but it can vary .2 either way, so testsome out.
There is a frame info tech document in the archive&gallery and the catalogue too.
They are mostly correct.