Hi Joe;
Nice find.
Almost any NEC multisync momitor will work. There is a adapter that goes from
9 pin to apple for the older multisync monitors and another 15 pin to Apple
for later monitors. I can get them here in Portland, Oregon at Oregon
Electronics. You should be able to find a cable house in your neighborhood
that has the adapter or a cable that would work. Other monitors like the Sony
should work also.
Paxton