You can also choose in the drop down for a 4 pin flat standard wiring kit that includes the trailer style pigtail on the bike side.
If running a 5 wire trailer system the bike side connector is different based on brand of trailers so the trailer side pigtail is not included it will come with open leads Green tail light, Brown -left turn, Yellow right turn, Blue Brake light, White ground wires and a pigtail must be used from your trailer manufacture.
If a Bushtec trailer the kit will include the wide Bushtech trailer side pigtail harness.
WE DO NOT OFFER ALL THE TRAILER ADAPTERS FOR EVERY TRAILER. A CONVERTER MAY BE NEEDED TO GO FROM A 4 TO A 5 WAY PLUG