Can't help I'm afraid.
Soccerway has fixtures from 1994-95 season onwards. I think RSSF is the same.
This site in French has fixtures from 1986-87 onwards (but 1989-90 links to wrong season) but doesn't have fixture dates.
http://historicfoot.com/crbst_1684.html
Shels site has 1993-94, but as you aren't asking for those games I presume you've seen it already?
http://planet_shels.tripod.com/histo...gueseason.html
I'm looking for results from 1989-90 season for fixtures between Dublin clubs. Do you have other results from that season?
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