You mean the plastic 90 degree elbow from the lower intake to the tensioner. You can get that at the dealer or auto parts store like Advanced, Autozone, NAPA or Kragen/Schucks/Checker. The aftermarket brand is made by either Dorman or Motormite. Around $10.00.
Motormite HELP PN: 47065
If you plan on DIY UIM/LIM gaskets let me know by PM and I'll send you a R&R procedure on PDF file.