http://www.efm-billet.com/
The problem with the KX-500 is that it doesn't have a separate cover for the clutch. Typically the auto clutch manufacturers will machine a spacer for the cover to accomodate the additional width. That's why no one makes one for the KX-500.
Garry at EFM said that he will try to fit it all under my side cover. If that fails, I will just have the area machined off where the clutch is and have a new spacer/cover made up and welded on. I don't give up easy. :boxing:
If you look at Destry Abbots 500 you might notice that it has a separate clutch cover (like the 250s have) which I asked him about (on his website) and his reply was that it was a factory part.
Perhaps Teamgreen500 would be able to help? might be worth asking him?
Possibly they use the standard cover modified to fit the 250 clutch cover?
I have not seen them side by side so am just making this up as I go allong here
The old cover would need to have the side machined off and then bits built up with weld to provide areas to drill bolt holes if so.
On the other hand they might just make up the whole thing.