This must have been answered 500 times already, but what the heck:
The following two sources do business on line, have on-line catalogs for the
more common parts, and will work with you by phone or by email to identify
the less common ones.
The first is in California, the second (I believe) in Tennessee. I used
both a couple times, with no problems. From my limited experience the first
source is a bit cheaper, but the second one goes 'the extra mile' to provide
a fast, personal service. Both were roughly 25%-30% below my dealer's price,
and unlike some other mail-order automotive parts businesses, don't hit you
with inflated 'shipping and 'handling' charges.
http://www.fordpartsonline.com/ or http://www.fordpartsnetwork.com /
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