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Hmm, I don't think I've ever seen one like that either. My '04 Edge doesn't have anything like that. Do you have 4 wheel discs? What end did that come from if you do?
Only thing I can think of is it'll allow for caliper movement?
I need a job making up names like that. I think I'd name the lugnuts on a 2021 Lincoln as "diaper swatch".
Looks like what we used to call "caliper slide bolts" according to the exploded view.
1984 newspeak just happened later than planned.