Are you talking about the UIM? Avenger is talking about the oil cap on the front valve cover. Does your UIM rub on the hood or are you saying that there is a difference in the valve cover design between the various 3L years?
sigh.....
there are plastic VALVE covers used on 02-03 taurus and sable engines.
the filler neck is a little bit lower than those 04-05 aluminum covers, it barely fits. here's a pic.
LOOK, VALVE COVERS lol. yes they are plastic, yes they are light, yes they work. hehehhee