It's hard to be sure looking at the pics, but on the replacement cover, the internal rebate setting the sparkplug aperture looks smaller than the original?
Im admitting defeat on this one, shame as they look really nice on the bike. So left is perfect no issues, the right i think ive taken too much off the central hole and its leaking there but still is at the bottom face. Feels a lot tighter in place and im pretty sure with some blue hylomar it would seal perfectly. Think i have now had this right one on and off about 10 times, and lost a good amount of good oil in the process. So i had a bid in on a couple of R9T that according to real OEM have exactly the same part numbers so they will hopefully fit and are in silver so more in keeping with the colour ive gone for the wheels.
Will put these up in the for sale section and see if anyone wants to try.
Cheers for all the pointers along the way much appreciated as usual..