Funnily enough my Spyder screen is currently sitting on my 356 body while I make a few modifications to the Spyder bonnet, and it pretty much fits the Speedster straight 'out of the box' (I'll take a pic or two later).
That suggests that the 356 Speedster screen and frame would fit a Spyder without too much trouble and would look pretty good imho.
Martin and Walker have the complete screen assy with frame, seals, glass and side posts for £495
http://technic-motorsport.com/M&W%20...s%20parts.html and I understand that they will sell them without the customer buying one of their bodies, but anyone know if they can be sourced cheaper elsewhere within the EU?