I added headrests to my 60 rear seatback by cutting the headrest pockets and surrounding brackets from a roached out donor set of front 60 seats and welding them into the rear frame. It wasn't that difficult to do. Just letting you know that that is an option.The 60's don't come with rear headrests or rear shoulder belts. For my kiddo's in the back seat, I’ve installed rear shoulder belts. However, I haven’t yet added a rear seatback that includes a headrest mechanism. The main differences between the FJ60 and FJ62 would be the type of fabric used, the absence of a headrest mechanism from a seat standpoint.
Feel free to PM me with your location, I see you might be in SWVA, which I flyfish often in that area. Might give me an excuse to come out.