No tensioner?! Serpentine drive belt on a 2019 Silverado/Sierra 6.2L (and 5.3) - how I did it.

I got sick of fooling with multiple different (and crappy) stretch belt tools that do not fit on the pulleys for the 6.2 L engine in my GMC sierra. I ordered and installed a tensioner and it was WORTH IT. Way easier. Should work the same on the 5.3 L engine. Used the ICT billet tensioner for the L87 engine.