I hope I haven't pointed you in the wrong direction, James. In buzzer's original restoration thread, he said it was a 1998 model, which would have used the later oil level plate.
However, looking at the picture of the unrestored bike
I see it had the old-style fluted clutch cover, which would suggest it's a pre-1998 model. If that's the case then, unfortunately, you'd need the other plate, which is no longer available.
The resolution on that picture isn't sharp enough to see where the lines are on the original plate so I'd suggest you PM buzzer and ask if he can check his photos for a clear picture of the original item.
If it turns out that you need an earlier plate, Albie might be able to point you in the right direction.