Constant,
I cannot answer the specific question - obviously you will have tried Koni sources, but the distance pieces, as you describe them, look just like the distance pieces that come with spherical bearings (Rose Joints.) Maybe the spherical pieces you need are also to be found associated with these readily available bearings ?
It does seem unlikely that Koni would make their own version if something was available off the shelf ?
Good luck with the search
Barrie