This means any 2 valve model from the mid eighties on through to the last of the 2V CARC bikes that use the deep spline hub.
Over the years there have been a variety of suppliers both to the factory and in the aftermarket of clutch friction plates. Many of them have been atrocious. Surflex always spring to mind as the exemplars of horrid ness being able to flog the splines in the center of the plate out within 5,000Km!
At the moment though there is a newer player called 'Newfren'.
When we did the rebuild on one of my customers bikes at 180,000km we did, for obvious reasons, replace the clutch. Problem is that it just shat it's gearbox input shaft seal at 230,000km and when we pulled the gearbox out we found that the Newfren plates we had used had also worn their splines really badly! No, they hadn't disappeared or turned to razor like nubbins but they were on the way. This is absurd when the factory plates made by AP seem to never exhibit spline problems and can last an absurd amount of time!
Now for most people this is unlikely to be an issue unless they oil their clutch but right at the moment I'd say if you do need to re-clutch your bike try and get the AP plates as they seem to be the best bet to avoiding evaporating splines!