Grrr, beaten by a minute!
IIRC, the warp-feed interface requires a cable to be purchased from Race, and the eye is extra cash-money too (100 euros).
To have the eye fitted currently requires your cocker be sent to race (or if you're in the US I think a couple of their distributors can do it now) in denmark, to have the body drilled correctly.
Good points though, if you take the huge amounts of time it requires to read through the forum on thier site, is that anyone who owns one will do pretty much anything they can to help a fellow owner. Also, unlike some companies out there, Race really do listen to what the player wants.
A bad point though: I'm not on commision from them