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I have a set of those real Minilites for my 99. The back side of each of them, where they bolt up against the steel hubs, is corroded from electrolysis and running them in the winter salt back east. I'm not sure about brittleness in them or what might cause it (stress? age?). They should be cleaned and tested with a dye penetrant. I think NAPA stores can get the kit for you. It's not cheap. I don't exactly remember the method, but basically you put the liquid on, clean it off, and then look at the part with a blacklight. The flourescent dye will penetrate any cracks in the surface. Of course there is no way of telling how deep the crack is. Talk to a wheel specialty shop about them. He might know other methods of testing them.
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