About to do a second wheel bearing on my 01 accord, this time rear right (replaced the rear left over a month ago). I couldn't get my hands on the aftermarket axle nut, so I went to the dealer and got it from there. I noticed that they are not exactly the same shape, but the threads are the same... As you can clearly see, the aftermarket one (on the left) has a much smaller diameter. Well, I currently have one of the aftermarket nuts on the wheel bearing I replaced over a month ago... It clearly is holding it fine, so my question is, does shape matter all that much?