Can't you use the Jap parts numbers? In the UK you can order any Honda part for any bike, European or not, they haven't got the microfiche's you just tell them the part number. Stuff from Japan tends to take about a fortnight but Honda Europe would appear to carry some NSR 250 parts anyway as some bits arrive next day.
_________________
Please do not PM me technical questions, if you can't find it on the Forum start a thread