Support Your Local Gunfighter (Wars and Westerns) (1971)

James Garner plays a ladies man who ends up on the run from a conquest. He has an embarrassing problem that requires a doctor, but that is not immediatly disclosed. He and a town barsweep form a plot to impersonate a well known gunfighter so that Garner can pay off his debts and skip town before the soon to come arrival of the real gunfighter.