Bruce,
The camshaft position sensor, a.k.a. the cylinder identification (CID) sensor, can be found as the following parts at the locations shown.
Wells F134, AutoZone/AZ.com $32.99
Motorcraft DU47, O'Reilly $40.99
Borg-Warner CSS29, O'Reilly $27.99
Installing it requires only removing the parts to allow access to the two, 5.5mm (7/32") bolts that secure the sensor to the rear bank exhaust camshaft's passenger side end. I believe that unclipping the DIS module, loosening the hose clamps and removing the two 12mm bolts that secure the intake balance tube to the intake can provide the needed clearance to the CID connector and the 5.5mm bolts. I didn't even need to do this on my car though. There is only one way to align the sensor and the job is quite simple.