These are the part numbers that I used for my Freedom WeCan conversion, but I'm sure they could help you get looking for the right parts.
WECAN IO card, Part number: 01-0264939-00 List price is $297.00
WECAN 18 CPM kit, Part Number: 01-046A501-00 List price is $198.00. This includes control point and harnesses
Lightbar power cable, Part Number: 46-0743196-17 List price is $152.00
Lightbar communication cable, Part Number: 46-0743442-02 List price is $22.00
Internal harness, Part Number: 46-0985997-00 List price is $83.00. This internal harness part number includes the front LED harness, the rear LED harness, and the outboard LED harness.