A DIY solution is trivial, two small Heim joints, two bolts to mount the Heim joints and a piece of threaded rod.
I did buy one that was on offer from a member (Montmil?) but when it arrived I realised it was made from imperial components, it remains somewhere in my spares collection.
I discovered that metric joints are available in left and right hand threads and cutting a left hand thread on a piece of for became my first ever LHT cutting project on my lathe. Having opposed left and right hand threads greatly simplified adjustment of the year lever, an important consideration on the target bike as both my wife and I ride it and my feet are somewhat large......