Talk to Bill Jenkins at Sentry Ford/Mercury/Lincoln in Boston, his contact info is in the Classifieds listing on the main page, also in the links.
SVT sideskirts are your best bet, about$65 each side unpainted. Add $60 per side for paint. The SE/GL Sport ones are about $200/per side IIRC. Of course ther are junkyards and other suppliers but none quite as cheap as Bill.
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