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I built that kit.I would assume that is a mount for a three tube rocket launcher installation. The later Mustangs had provisions for carrying rocket tubes outside of the bomb/drop tank mounts. as shown on the old Hawk model kit.
View attachment 872022
Me too, And I still have one unbuilt. Better in some respects than the much later Monogram 1/48 kit but the rear fuselage is much too narrow.I built that kit.