Browsing the parts at Team Ford, I see V8 exhaust manifolds for the '00-'02, '03-'04, and '05-'06. I don't know what the deal is, but the '05-'06 manifolds are, by far, the least expensive.
'05-'06
L: $120.35
R:$122.24
'03-'04
L: $383.46
R: $311.02
'00-'02
L: $333.56
R: $142.71