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The flange can be replaced with a yoke. I'll be doing that with mine when I get around to the gears. I don't have any info right now on what fits, but I suspect there are several options.

A...

Yeah, that sounds about right. I just did a rough measurment my old axles and came up with about 56.5 after you narrow it. I had to get custom axles for my project since mine had to be narrower...

The 8.8 is a good choice. Why do you need bolt in axles? Are you going to race the car? I can tell you from personal experience that a disc brake caliper will keep the axle from exiting the...