thanks. while it appears the 860 duc used 450 duc pistons, the 450 looks like it has a 22mm pin. The 860 piston may be more suitable in a short stroke VH 86mm bore. Now I just need the height from the top of the pin to the top of the piston at the side and centre and hopefully with minimal machining it will fit.
JP no longer do one off pistons, even though they state otherwise on their web site.
Precision pistons in Melbourne want $700 for a one of, so I am looking for a substitute that I can adapt.