In Ohio, a seat belt ticket is a secondary offense, meaning you have to be pulled over for a moving violation. They're supposed to have a reason to pull you over before giving you a ticket.
Of course, that reason could be about anything. But that can also go in your favor to beat it.
You also don't don't need to be buckled in the back seat unless your a child who weighs less than 40lbs. Oddly enough, in Ohio physicians or chiropractors, newspaper and mail carriers are exempt from wearing seat belts.
Fortunately, or unfortunately, most (not all) cops are actually morons when it comes to the law and older cars.
I was pulled over once and was able to convince the 20 something cop that my 74 Duster didn't come with seat bets. What I wasn't able to convince another young cop of, was the actual law regarding historical plates. I have 1974 Ohio plates on said Duster and the idiot kid that pulled me over had no clue about how Ohio historical plates work. That took a judge scolding a cop about learning the law. That was kinda funny.
Good luck!