The Petty Dwarves in Beleriand would almost certainly have been descended from outcasts from Nogrod or Belegost, they being the nearest 'Great Dwarves'. It is possible of course that outcasts from the House of Durin would cross the Ered Luin into Beleriand but far more likely they'd form their own communities in Eriador, perhaps in the Weather Hills or the Downs?
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