Update: Diamond rep said I need to talk to a professional installer, which doesn't exist in the central Tokyo area. I have to drive 24 miles to visit the installer.
After some research, Comet (another antenna base manufacturer) has similar products.
This one's legs look a little wider than Diamond's. I could clamp the rear tailgate lip with an aluminum protection plate.
In the meantime, I screwed Diamond K416 on the tailgate lip without the aluminum plate. I will attach an antenna tomorrow to see how it stands straight up.
After some research, Comet (another antenna base manufacturer) has similar products.
In the meantime, I screwed Diamond K416 on the tailgate lip without the aluminum plate. I will attach an antenna tomorrow to see how it stands straight up.