Getting ready to order C&L Plenum, have question

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the difference may be that from 99-mid 01 the ait sensor was in the intake tube and mid 01-04 it is in the plenum(i believe). One may have a place for it on it and one may not. Just make sure you get the right one.
 
The plenum for the 96-01 has a smaller, 3/8", hole for the IAC valve compared to the 01+ which has a 5/8" hole. Ford made this change in the middle of the 2001 model year. If your water pump pulley is bowed inward, it's probably the 5/8". The best way is to go measure it.