Maybe that got mixed up. Longer shock allows more down travel (extended length). Shorter shock allows more upward travel (compressed length). As suggested the best thing is to try it out. Ideally your leaf springs limit the down travel before the shock does and the bump stop should limit up...
Seems right. From what I can find they are a Chinese company that has been making ARB knockoff (older style) lockers for at least 10 years. Not sure how recently they started making e-lockers. Didn’t find any reviews from someone that had actually bought one.
Jim has s few posts for his skid plates on Mud. This is a recently active one if you want to link it.
https://forum.ih8mud.com/threads/fj40-45-h-d-skid-plates.1241006/
There are a number of posts on temp/fuel gauge problems. Here are a couple comments from an expert. Maybe the voltage regulator is going out and you need a new fuel gauge.
The city racer mounts showed up and were way better. They are a Japanese aftermarket. All the stock hardware worked with them. The locating nub is a bit taller and not chamfered like the factory nub, but still worked fine. Probably even better since it engages more threads and it’s a short...