BBS RS Valve stem size??

[_lowcl9]

What up guys. Was just about ready to throw some fresh rubber on a set of bbs rs I refinished and was gonna re use the valve stem till i found out that it had a leak. Now im im in the market for new valve stems. Wheels are 17" lips with he OE 0.5 lips. Anyone know the size of the valve stem hole? Or how to measure them? And where i can get the best quality stems at.

Any help is greatly appreciated. Thanks.