Which 3 buttons? The early roadsters didnt have the remote stereo controls on the steering wheels - they just had the cruise control buttons if they were the GT pack. But, the later ones, like mine have both the cruise control buttons (2 buttons and a toggle switch), plus the remote stereo controls (4 buttons).
They dont have the bluetooth phone buttons however...
The buttons on my 55 reg GT and Caroline's 08 GT Roadster have quite different functions...I've just been out and had a look, never realized that before, probably because I never use them . Here's an earlier GT roadster with 3 buttons, I didn't know that the non GT roadsters were button free, always thought they were imports
Pete