You're going to have to swap out the K-member first of all. Mounting points for the Windsor engines are different. You can use one from a 1994 or 1995 5.0L Mustang or you might as well do it right the first time by going with a tubular K-member. Advance Auto Parts and Autozone carry the pans under part number FP16B for roughly $75. For the oil pump screen Advance Auto Parts is 83-S1 from Melling Engine Parts for $18.28. Autozone has the same part number, but for $24.99. NAPA has the Clevite brand COP6011571 for $28.99. The Melling (and Clevite) oil screen opening is considerably larger compared to the stock one.

Another part number to cross reference with is Sealed Power 224-12143 if you find one around.