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If you punch into a gm parts site it might give you alternative numbers also(superseded by #).
found it - there are no superseded numbers -
that part was used only on 1994 through 1996 Deville - Seville - and Eldorado -
where to buy a new one - try this -
http://oemcats.com/oem-parts/18018429.html#shops
by the way - there are TWO of these on the car - one for the right rear - one for the left rear -
one is mounted near the rear - the other is mounted near the master cylinder -
