Good idea.
They have a different part number and they look different in width.
GC8 = 21896AA050
GD8 = 21896AA072
Might be able to fit it IF they got the same bolt pattern, but i couldn't find any descriptions of that.
EDIT: I got this answer from Luke @ Importcarparts.co.uk:
"You cannot put a GDB Recirc valve on a classis as the hole in the intercooler doesn’t line up with the hole on the valve and it ends up sucking air in from atmosphere"
I have just ordered a Forge Motorsport V5 Recirc Valve. Mods can close this thread now.
Dan @ Dcperformance said this regarding max PSI:
"Out the box they go up to 26 psi, and you can go to the red spring which is around 35 psi"
Thanks for the help everyone. :)