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Those studs appear to be soft metal, I'm guessing all thread. I wouldn't recommend replacing a stud with that material though.
Try calling Iconic parts and and ordering a set. Chances are they may be able to get them as they did build a build over 2000 BDRs in that configuration.
Baring that then find a Machine shop or a Welder to cutoff the old stud and attach a 10.9 (=grade 8) or a 12.9 rated bolt. Once welded on, lop off the bolt head.
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