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The thing you need to find out, is what size you have and what size those are for. 12" and 13" are the options. if they match up your good to go!
BUT... why bother? Same calipers unless its the 96 Black Grandsport ones (in which case its for 13"). Unless you plan on painting/powdercoating them I wouldnt mess with any of it...
The 96 calipers will work on your 89. You'll need to get the caliper brakets though. The 96 came with 13 inch brakes while the 89 was fitted with 12 inch brakes.
Ok, the Calipers need the correct brackets to match, the factory brackets for the 96 calipers will work for your 89. You also need the 13" rotors also, as the 12" rotors are not compatible with the larger calipers.