Was there, or is there any rear spoilers available for the Cabriolet , after market or what ever ? . Just a little duck tail on the trunk edge ? .
Techart made some. Currenlty you can get a similar one here: http://www.porscheshop.co.uk/acatalog/porsche_968_body_styling.html
The picture shows it mounted on a 944 S2 cab, but it says it fits the 968.