Update!
I replaced the 2016 plug with the Mouser Electronics
plug and
pins and installed the 13521066 module I bought from the parts department at the local dealer. It works great!
The module screws in to the same location without any mods.
The attached photo shows the old 2016 plug next to the new 2018 jack and illustrates the incompatibility. There have been others that have reportedly modified the old plug to fit into the new module. The wires do line up the same, but I didn't want to do half a job and have to come back to fix it later after possibly vibrating apart.
The plug was a little finicky to install since I didn't have the proper tool for crimping this particular style of pin. My redneck crimping along with the larger insulation on the black wire made it a bit challenging but I was able to force the pin into the plug on the first try and a little help from a tiny Allen wrench. Mouser Electronics minimum purchase of 100 pins left me with 97 more tries but I didn't need them.
I recommend paying close attention to how the new plug assembly snaps together when you wire it. It comes in the "open" position so you can see the pins are seated at the end of the barrels before you snap it shut. Make sure the colors are aligned properly and the plug it is "shut" prior to plugging it in to the jack on the new module.
I recommend getting all of the proper goodies from Mouser and GM and doing it right the first time.
Good luck!
