yo Paul,
Vehicle Emission Control Information(VECI), PUK (49 States) Decal, PGP (Canada) Decal, Vacuum Diagrams & Calibration Parts List for 88 & UP now On-Line at Ford:
go to
http://www.motorcraftservice.com
Click "What's New" in left panel
Scroll to: "VECI labels are now accessible through Quick Guides without a subscription."
Enter applicable info (need to know your Calibration number off of your PCM or driver B pillar sticker)
In this example D1T4 is the required number.
& Emission Parts with Ford MC PN's:
such as:
NAME/DESCRIPTION ENGINEERING NO. SERVICE NO.
SENSOR ASSY, Catalyst Exhaust Gas Oxygen Monitor- DOWNSTREAM