I just bought and installed AutoTrends rear bench seat protector which according to the box features waterproof nylon fabric, for rear bench seats, and easy slip on design. Price was reasonable at $19.99 in Canadian Tire and the Canadian Tire part number is 032-1426-2 I believe AutoTrends may be a Canadian Tire house brand but I am not sure. It was an in store, in stock, off the shelf purchase and is a greyish black. I have the Mitsubishi rubber cargo mat and intend on installing vinyl black runner on the back of the seats to keep that area decent when my wife hauls bags of dirt and crap to and from greenhouses and recycling. (I don't work for Canadian Tire!)
Mitzi is soon to be her car. I am just the lead mechanic and gofer on it. Mitzi is replacing her A123 converted plug in Prius.
Rocky