SHELBY GT 350 Member
Joined: Sep 2010
Location: see user name
Only place I would know to look for that is RockAuto.com. You may also have some luck checking Ebay, local pick n pull, and as a last resort you could try Ford dealer parts dept but that part has been out of production for a long time now so I don't know.
You mentioned that controls the IMRC's, you may consider just deleting them if nothing else pans out (kind of a popular mod for your engine anyway).
2001 GT Convertible
All the usual bolt-on's /200 I6, C4
And a few Explorers too... 2008 4.0 XLT 4x2, 1996 XLT 5.0 4x2, 2003 Sport Trac XLT 4.0 4x4