I can tell you that a 1/2 nut won't thread on, because they are 7/16" threads on the M416. When I measured the center hub for my adapters, it measured I believe 3 3/4". I could measure the center of the original wheel if you like tomorrow.
Mind if I ask what size of wheel adapters and what you are adapting them to?
I also have a 416 that I need to move the flange out about 1.25 inches with a reduction to 5 on 4.5 so they will match my Jeep wheels. I'm curious if this is somewhat like what you are doing and if so, where did you get them?
I am using the adaptitusa.com wheel spacers. I went with the 2 inch thick size to adapt down to my Jeep JK wheels. I am running stock wheel back spacing and I wanted to increase the spacing from the frame as much as I could.
Sounds like you are doing something similar to what I need to do.
I want to run the exact same wheel and tire combo I have on my Jeep. This means a 4.5 inch back space and they will not clear the inner fenders that way. So I need to go out as well as reduce from the 5 on 5.5 to 5 on 4.5
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