Dave's right. I went to Honda yesterday and ordered a rear sproket (as both bike need one) on the off chance. The chap at parts said no its japanese we dont do them....!!! The Manager of the shop overheard it was for a NSR and he came wondering across, soon found out hes got a Mint near original NS400 and a MC18 Walk this way he said He had Micro Fich for just about ever import, found the part number and entered it as a LIVE order and hey presto it appeared. It arrived today it was in stock. Honda do have them but the important bit is THEY MUST DO A LIVE ORDER otherwise the computer will say the part number is invalid. So parts are easy to get hold off and as dave said Andy can get anything NSR drop him an email with the bits you need it will almost certinly be cheaper, My rear sproket was 48 quid around 75 euros