We may or may not be confusing the OP. He/she hasn't responded for 6 days. Economies of scale would say that you produce one harness for that model and plug in the buyer's options. That's why the OBDII port for the 3.8L exists in the GT harness.
KB 2.1L @ 9psi, FRPP M5400-A Suspension System, FRPP Aluminum D/S, Built AODE and TC, FRPP 3.73 Gears, Balanced Roller Cammed Engine, Edelbrock Performer Heads, Comp 270AH cam, AEM EMS, 3.5 Bar MAP, Zeitronix ZT-2 WB, FRPP 70mm TB, modified UPR CAI, Be Cool Aluminum Rad