Hi Gert
I have used Talon to get my two rear sprockets, and they have been very helpful, but a bit costly.
I still had a sprocket from my old DL1000 (K8) (JT Sprockets No JTR 1876) in the garage and the sprocket spacings were the same as the 800RE, so that's what I ask Talon to make me, as usually they only go up to 47T, but did not have one at the time of ordering.
I hope this rambling makes sense.
Cheers
Crazyhorse