Makes, sense. Not sure why GM didn't inlclude it with the vehicle. Better to have a seatbelt on than nothing at all. And, this idea is for a young child not a grown adult.
There are numerous times when you may have 2 adults and a child in the back seat. This 3rd. belt option is a great idea.
2010 Camaro SS, P1SC SuperCharged Livernois LSX429ci., 1 7/8" LT Headers, full 3" MBRP exhaust, SPI built/tuned, a total