no xx.14 on the parts diagrams (must have been superseded by something).
http://www.********************************************.c om/porsche-parts/hardparts.php?dir=986-97-04§ion=902-20
xx.16 is for 03/04 3.2 car, xx.18 is for 03/04 2.7 car (uncertain what difference displacement makes to engine wiring harness, but presume something otherwise they would use the same harness).
don't get anything pre-2003 - o2 sensor connectors, timing, wheel speed sensors different.