2016 Silverado upper and lower control arm???

[Rickyace09]

I have a 2016 Z71 Silverado with Aluminum upper and lower control arms. I need to replace the lower ball joints and wondering to just replace upper as well but can't find replacement oem ball joints anywhere. Does anyone know of a gm part number? My local dealer gave me a part number of 22855747 for the lower ones to be used on aluminum control arms but had no idea for the option on uppers. 

[davester]

look on rockauto?  It may be that the upper ball joints aren't replaceable/sold separately, and you have to replace the whole UCA.  I know for my '12 3500, I have to do this.

[MikeBMW]

In my experience, it has always been a full UCA replacement.
To be fair, I did this due to the lift I put on the truck.

[ftwhite]

Cost is about $40/ball joint or about $150/ arm with ball joint. Personally, I would chose replacing the arms because pressing the factory ball joints out and the replacements in is more difficult because of how they are crimped in. 
Second the recommendation to find the part number on Rockauto. too many variables to just throw one out there.