I'm trying to help a friend of mine that has a 2006 Z51. The rubber in the clutch master cylinder cap as swelled and removed itself from the plastic cap. The obvious fix is to spend the $5.00 and buy a new cap. Problem is no one seems to think they exist, at least not on their own. Best thing I have found at this point is buying the whole master just for the cap. This seems a little crazy. Can anyone point me in the right direct for finding and acquiring this simple little part that is oh so essential? Thanks in advance.