+1. But using ali nuts on steel bolts is always asking for trouble. I have had muteki extended open end nuts for 5yrs with no probs.
Whilst genuine D1 Spec nuts are better, they are still al. They corrode onto the steel hub bolts in no time over winter.
Sorry, I didn't make myself really clear, I understand the steel/ally prob but I was referring to D1 Spec fakes breaking when being tightened because crap grad ally was used to manufacture the fakes.