MZ 500R rear sprocket needed

Hi, my rear sprocket needs to be replaced this summer but the problem is that I have not been able to find any source where to buy a new one.
My bike is MZ 500R 1992 with Grimeca 16" cast alloy rear wheel. Chain is 520.

Does anybody know who sells these sprockets?

I've looked at JT-sprockets with no luck and German Esjot stopped making them for 500's.

Timo from Finland

Hello, if I understand that right you search for theese thing --> click

Hello Timo,
maybe www.motorradente.de has the sprocket.
Martin.

Hi, Woelli's link is just what is needed for my bike and my friend's Red Star combo.
I also got an offer to have the part brought to me to the 20. Finnish MZ-rider meeting 15-17.6 2012. Great service!

Many thanks

Timo