Thanks for the comments, unfortunately the fairing went some years ago so now looking for a replacement either Vetter or another Rickman, I can probably find a fairing in the UK on Ebay but there never seems to be a suitable mounting bracket.
This seems strange as a lot of the marketing litrature from the 80's shows a Z1000ST or Z1000 MKII with a Vetter full set, problem is the ST was only made 79 and 80 and is a different frame to most of the other big Z's.