I don't have any pics of the boos at the mo as the wheel is still on the car but if you check this link there is a picture of the wheel in the car.

https://passionford.com/forum/ford-rs-cosworth-parts-for-sale/258320-thinking-of-selling-big-brakes-and-grp-a-wheels.html

As for fitting a 3 door I don't see why it shouldn't as I'm sure the the 3 door and sapphire steering wheels are interchangeable.