Unless you really like the "flared" look or you're adding them to keep the cops off your back, why bother? Some of us have had no flares for a long time, if you need it for law enforcement reasons I would add some generic flares or get some from a wrecking yard. Not sure about NY law but here in California there's a myth that you can't have tires sticking out more than 3" from the body, but the code for fenders just says.............
V C Section 27600 Fenders and Mudguards
Fenders and Mudguards27600. No person shall operate any motor vehicle having three or more wheels, any trailer, or semitrailer unless equipped with fenders, covers, or devices, including flaps or splash aprons, or unless the body of the vehicle or attachments thereto afford adequate protection to effectively minimize the spray or splash of water or mud to the rear of the vehicle and all such equipment or such body or attachments thereto shall be at least as wide as the tire tread. This section does not apply to those vehicles exempt from registration, trailers and semitrailers having an unladen weight of under 1,500 pounds, or any vehicles manufactured and first registered prior to January 1, 1971, having an unladen weight of under 1,500 pounds.
Check your states DMV codes to be sure of your laws which are probably different from CA. I think as long as your truck is legal in all other matters & you're not driving like an ass, most cops won't bother you. That seems to be how it is here in CA anyway.