Just kidding, DC.
The Irish market is very small compared to others, so focussing on a specific timeframe may cause headaches.
I, too, have collected a few locos and coaches from the pre-historic era, and a few from the SuperTrain transition from pre-history to the dawn of IR and IE civilization.
With the likes of IRM and PM putting so much at risk to produce these models, it seems almost obligatory to support them, no matter the era.
Hopefully, the OP benefits from the extra publicity of having their thread hijacked and finds those autoballasters!
Sorry, @RonanOC