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Only one bar is broken, no need for 2 new ones.
People don't get 4 new tires if one comes apart prematurely do they?

There's no left or right bar with the JS bars. Both are the same.
Ofcourse when you used them in a car before it's advisable to keep them at their initially installed side.

my concern would be that they were bought as a matched pair and its very likely they were forged by the same people on the same day with the same material from the same batch using the same process that had the same contamination or defects. Good luck.

Mopar to the bone!!!