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I don't know that you can't, but I believe they use platinum because replacing them is such a b!tch. Put in cheap plugs and you'll be doing it more often.
The fact that it is a 93 model would suggest that she's a 3 litre. You can use standard type plugs as they are reasonably easy to replace. The reason they used platinum plugs on the later 3.5L is that you have to remove half the inlet manifold to replace them!