That is going to be a bit more than just a simple harness. The wiring goes from the ignition to the PCM then PCM to the starter. I would try to contact J&W Jeep - J&W Auto Wreckers - New & Used Jeep Parts they may be able to get you one from a wrecked Jeep. I would assume you have to match model year and transmission type.
any idea what the part number is for a 2013 wrangler sport jk?
It's not a single part number there is multiple.
I would advise in a new thread with pictures and great detail share what the issue is so we can help sort out what part of the wiring you need and whether or not it is even available as parts or if you will need to find a wrecker.
On Jeep #6 & 7
91 XJ 4.0 > 93 YJ "4 Angry Squirrels" > 95 ZJ "Magnum" Limited > 07 JK Sahara > 15 JKU Sport S > 16 JK Rubicon & 17 Renegade Trailhawk for the Other Half