Closing the loop here. So to quickly review my original issue, I have narrow trac axles and when I bought my jeep several years ago it had after market wheels on it with backspacing and width that gave it a nice stance. I've always liked the original wagon wheels and so I bought a set of the 15x7 to put on. Well when I did that the it just looked silly to me because I went from 10" wide wheels to 7" wide wheels and change in backspacing that made the stance way too narrow looking for my taste. So, I found a set of 15x8 wagon wheels that were factory drilled for center caps thinking that the extra inch on each wheel would give me the stance I wanted but it turns out that the factory 15x8 wheels have 4 inch backspacing vs the 3.5 inch backspacing of a 15x7 factory wheel. So I really only gained a 1/2" width on each side which still looked to skinny for me. In the end I ended up putting 1.5" wheel spacers on to give the stance I wanted but when I did that it offset the center caps so that they would no longer fit on the front manual locking hubs. Details and pics of why it wouldn't fit can be found earlier in this thread. So to fix the center cap not fitting issue I found a machine shop that built a jig to cut the center caps in order to fit the hubs. I think it turned out great in terms of being a clean cut. I was afraid it was going to come out mangled looking.
Here's what the cuts looked like..
And here is what it looks like once installed...
Unless you get really close you don't really notice that it has been modified with the exception of the manual locking hub being inset 1.5".
Let me know if there are any questions.