i don't know.
i mean, i don't know what wire braces are. at least in an old timey sense. i've seen cheap wire ones on newer bikes (i mean like post 70's bikes) and i've always thought they were junk.
fender construction in general has gotten weaker. the steel is thinner, the braces and brackets are thinner and weaker, and they're just not built to last.
i'll say it again. for replacements and upgrades, Wald Fenders and Braces.