Could be another nice find for you, like the targa top. Certain old momo wheels are desireable. (It's like the difference between BBS RA's and BBS RS's in the VW world.)
Here's one thread with some detail.
http://forums.pelicanparts.com/showthread.php?t=402849&highlight=flat+prototipo
PS-my son makes "vroom" noises and points at the garage at least once a day. That means it's time to go sit in the 911 together and play with the wheel, shifter, etc.