I literally just got one. The nozzles are discontinued so you have to buy the whole arm. Don't do E-bay, I did and it isn't the same.
Do GM partsdirect, Nalley or Tonkin. If you want exact, pay the extra few $$.
Of course my drivers side sprayer decided to work perfect after I ordered the arm. Fkn thing didn't work right all summer then froze in winter.
Then unfroze and voila, I got the squirt.