Hum? Not specifically with a US number. I might be able to ask a local cop if he knows but that is 50/50.
In NYS you are required to "wear a seatbelt". That generally means the combination shoulder harness/seat belt.
The Shelbys are the only car I can think of with an additional shoulder harness in addition to a seatbelt.
If I can get that info, I'll pm you here on this forum. What I expect the cop to say is that yes they agree and that there is just this extra box that you check on the summons that indicates the infraction is "not wearing the restraining device, i.e., harness".
That's because it is a casual inquiry. What I could do is take a picture of the shoulder harness in my car and walk into the local precinct and ask the desk sergeant? We'll see how this goes.