Well i can help with the numbers, their are 18 class 071's numbered 071-088, the numbers in this don't really matter, they are quite a strange looking beast so quite easy to tell them appart from other locomotives. NIR have 3 "class 111's" which are glorifided 071s, numbered 8111-113, again numbers don't matter. And from what wikipedia tells me is that their are 4 in Yugoslavia! Now, as regard the models, heres the cheapest i could find them, the only reason i havent put this up sonner is because im very selfish.
http://www.dckits-devideos.co.uk/shop/kits_modelling/irish_railways_inc_murphy_models_rtr_kits_transfers/index.php
Now please remeber, it is a rich mans hobby!