No, I used the harness that was originally available from PacParts. This harness is no longer available (I just did a new search for an alternate source for this harness, and it doesn't seem to be available anywhere).
The harness from netaudio that comes closest would seem to be this one: https://netaudio.com/product/jeep-wrangler-amplifier-installation-jeep-wrangler-gladiator-jl-jlu-jt/ However, there are two things to be aware of with this harness. First, it will not be "plug-and-play." The PacParts harness came with the plugs that went right into the Alpine KTP-455. You could literally just connect everything and you were good to go. With the netaudio harness you'll still need to connect the wires at the end of the harness to the plugs that come with the Alpine KTP-455 amp. This will still be easier and cleaner than cutting into your factory harness, but it won't be as simple.
Second, the netaudio harness has resistors already installed into each channel. This is great if you are hooking up a sound processor / amp that is not that KTP- because with most amps you have to provide some resistance in the lines (otherwise, the Jeep's audio system thinks there isn't a speaker hooked up and turns off the signal to the channel). For whatever reason, the Alpine KTP-455 amp must provide its own resistance- because no resistors are needed when connecting that amp.
I notice in the notes that netaudio indicates they can make a harness built specifically for your application. It is possible they may be able to create a harness that would make the Alpine KTP-455U truly "plug and play." My guess is it would involve you sending them the plugs that come with the Alpine amp and have them directly wire them to their T-Harness.
It's really a shame the Alpine harness is no longer available through PacParts. I'm guessing Alpine noticed people have figured out you can piece together their audio upgrade system for far cheaper than they charge for the entire kit, and they're trying to make that harder to do.