The XJR I got last week came with the R1 Performance pkg and I've never seen wheels without a valve stem. I searched the car but could not find this detachable stem thing. Could someone post a picture and name this piece (if not called valve stem) so that hopefully I could locate one?
Thanks!

 

its a filler tube ... would be in the glove box or console. Looks like a silver tube threaded on one end. You can buy them at BBS. I think there is a thread where I posted the info.

 

search for:
tire valve fill tube bbs milan wheels