Hi Petros

If you search on yahoo japan through noppin and type in nsr250 mc18 sp in the search or nsr250 mc18 seal/sticker you may find one. It invloves a lot of searching but there is always new old stock turning up.

For example, there are two 88 mc18 right crank shaft seals at auction which are also discontinued.

You will however have to register with the auction agent and bid for the item and incur additional charges. It all comes down to how much you really want the item.

Sami