have you tried cyanacars. I don't think that their website works, but that doesn't mean much in the kit car world.
Cyana Cars
Unit 7 Puritan Buildings Halton Road, Runcorn, Cheshire WA7 5QP
p: 07834 077934
http://www.cyanacars.comEmail Cyana Cars
Rainbird racing are the alternative. These guys have a similarly inactive website!!
I am told they can be contacted via Caged
"
The Phoenix project is owned by Rainbird Racing (a division of roll cage specialist Caged Manufaturing Ltd
www.therollcagepeople.com or .co.uk?).
They took it on from Ian Grey when he sold the project a couple of years ago.
The business is run by Phil Squance who can be contacted at Caged on 01373 452866.
"
In both cases I believe that they just buy them in from somewhere. They are eye-wateringly expensive (I think I paid £65 for a pair), which seem to be made out of PMMA (aka plexiglas, perspex) which can be a bit fragile!
Good luck,
Matt