can I change just the ignition switch without changing key tumbler on 1997 Buick Skylark

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KEY AND TUMBLER COME AS AN ASSM.THE IGN SWITCH PORTION IS AT THE BOTTM OF THE STEERING COLUMN,TWO DIFF THINGS.IS THE PART AVAIL?
on this model the switch is on the left hand side of the column held in by two small screws right behind the tumbler. The switch is avail