The Yamaha items are forged, and as a result there is a 'seam' evident just above the mating surface flange. My drawings have duplicated this, and the hope is that when they are Machined (CNC) from billet, and then bead blasted to a similar finish, that you won't be able to tell the reproduction from the Yamaha part.
I need quite a few sets for my own projects, and will be selling some to enthusiasts as well.
These are not just YEC unobtainium bling, they actually help prevent crankcase breakage. (see picture 3)
Price is expected to be about $190 Australia dollars a set. If your interested let me know. They will be available in about 6 weeks time.
If you are not a forum member you will have to join up to make contact with me via pm... And a great bunch of guys... Cheers
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