Taillight or marker light fuse

[Braaap60]

Hey there I have a 2014 Silverado 1500 5.3 and I'm adding the 2015 oem 2500 cablights. I bought the wire harness and plugged into my passenger side fuse box and of course cab lights don't work. No biggie, I dissected the harness and have the +/- wires exposed. I plan on running a fuse tap off of my market light or taillight fuse to power the cablights , they are led and don't require much power to run as I was using a 9v battery to see how they looked.

 

So can someone help me out with where and which fuses I need to locate, thanks in advance !