92 were 1 1/8” but used a quil stem and their own Impact headset.
IIRC they were originally supplied with a rigid fork with an AtoC of 390mm.
I thought that these weren’t suspension corrected.
Later 90’s rigid Konas were supplied with 410mm AtoC rigid forks.
390mm AtoC + Sub 60mm travel (Mag 31, Manitou 4 etc)
410mm AtoC = Approximately 63-65mm travel
425mm AtoC = Approximately 80mm
All that said I have always thought that Konas have benefited from a slightly longer fork.
For the OP I would have thought either go retro with a super reliable Marzocchi like a Z2 with 65mm travel or run a modern(ish) Reba and space the fork to around 80mm or just under.
I ran a Kona of this sort of age with a 2008 Reba set at 70mm.
1994:
1999: