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Probably because the vast majority of that body type had a single exhaust, hence that bracket is spot welded, and those cars that had dual exhaust had the second bracket bolted in.
http://www.forbbodiesonly.com/moparforum/showthread.php?67955-Exhaust-manifold-coating
Loads of answers in link above, where you asked same question a year ago.
I went the ceramic coating, looks great and lasts...