for anyone else that has this happen, part number is
ACDelco 10335503 avail from Amazon for $23, no shipping, no direct tax

 

And here it is for $17.50. Don't know what they charge on shipping.

http://www.rmsautoparts.com/proddeta...?prod=10335503

 

Mine accidently came off when I was drying the SS off. Just inserted and twisted it back on. Gonna have a look at it and try to find a way to make it more secure so grubby little hands don't make off with it. Maybe a rented hand with a shotgun.... Anyone interested!!

 

tHREAD locker works great