Thanks for the explanation Fran.
Seems less of an issue to me now when other Irish stock has the same buffer spacing e.g. 141's.
Still a bit confused as to why this decision as regards buffer beam spacing was taken for this particular range of wagons and not all of the other IRM wagons and locos released to date. I suspect that there may have been more discussion surrounding this if made known earlier when wagon plans were first made public.