I have been writing back and forth with the local supplier because I was looking for 16 inch wheels to fit the early Jeep CJ-5, which uses 5 on 5.5 pattern. Turns out they do have access to these for the same price as the others in the same fitment range, if you don't mind waiting for them to be shipped from Oz. In the 16 inch, 5 on 5.5 pattern, two back space choices are available: 3.9 inches and 4.2 inches, with a 7 inch rim. I figure that with these wheels, I won't need to worry about wheel failure.
So, if you are interested in the wheel but don't find your size listed in the web page, give them a call or send an e-mail and inquire. The size you want may be available.