corvette tire pressure sensors

Ive got a set of Z06 wheels with tire pressure sensors in them. one of them is leaking, ended up being the screw on nut from the outside that keeps the stem tight to the wheel, its cracked in 4 places, and i need a new one. not sure where to go to get it, should just be a cheap couple of bucks. i dont want to replace the sensor completely cause i dont want the tire coming off the wheel.

these dont need to be pressed in right? when i took the pressure out of the tire and took the broken nut type thing off, the sensor is loose in there and will fall into the wheel if not being carefull.

i tried one place and they told me to try a dealership.

any thoughts?

http://i75.photobucket.com/albums/i296/jer4251/DSCN2366.jpg
http://i75.photobucket.com/albums/i296/jer4251/DSCN2367.jpg
http://i75.photobucket.com/albums/i296/jer4251/DSCN2368.jpg