I am replacing them mainly because I had to cut the heads of the stock ones off(the rear rotor, anyway). I couldn't get them out. The pulley ones I just wanted them to be black, not silver.
I bought very few black oxide bolts, I think these two items were the only ones, actually. If they don't hold up I can replace them later on when doing tires again. But if the oem hardware hadn't rusted in 7 years and I assume it's the same material/coating, why would these?
Just looking for confirmation of what 4 dots on the head means. They are like indents.