Found a rare key it yourself spare tire lock set. You can only find one that come pre-keyed with another key instead of using the one already in your key fob. Now i know how to key these lock cylinders.
It's a 3D printed unit complete with the lights. It's a pretty cheap setup but it does stick out quite a bit. I can't say compared to other ones or there but I'm guessing it's similar in size. The optional gasket they sell doesn't look like it seals a 100% so, I'm going to add a foam style...
I haven't actually used it but it'll mostly be for strapping across to the front. For strapping to the rear i haven't thought about that but I also carry standard straps.
There are no door modules for the rear like the fronts. So there's no one touch on the rear. Depending on the model you may or may not have global windows that allow 4 window control with the key fob. There are no one touch modules that work with this configuration as the previous generation...