Yes. It does seem he made the 4 to 7-way as there is no extra part listed for it. (See attached invoice.) Unless they forgot to list something else? I decided not to have him hardwire for a brake controller, but he did wire for power in case I get a blue tooth controller. (I don't even have a trailer yet!)I was surprised to hear the Canadian professional installer mentioned above is using the same 4-way Curt #56420 plug and play computer unit and wiring up the rest of the 7-way themselves, so they are basically making their own 4-way to 7-way wiring from scratch.
I remember him saying he closed off the brake wire so whatever he used had it? (Which doesn't really make sense to me if he's creating the 7-way from scratch, so maybe I misunderstood him.) Then he extended it all to sit closer to the hitch. I've no clue why Hyundai has their wiring so dang far. It's nice and clean this way (unlike my trucklet!), and it's tucked nicely underneath the bumper. It doesn't stick out at all.
If you want any photos of what he did underneath let me know. I just snapped this one quickly when I got home. Also, this was their first wiring of a SC hitch. The one they did last week was hitch only without wiring. He said once he looked under and saw it all right there (I guess he meant the 4-way pre-wire?), he was gold.
The invoice shows 45 minutes for installing the hitch and 75 minutes for the wiring and bracket install. And this was Hitch House.