The rear shelf came with the cruiser when you bought it for the first few years. Chrysler started deleting things on the cruiser as a cost savings measure like the engine vanity cover and the passenger side outside door lock. Eventually the rear shelf and I believe the rear cargo net both became an extra you could buy but it didn't come with the PT purchase. You can find them on eBay and on the "for sale" sections of PT forums. The stock shelf looked like this:
You could put it in 4 different positions including a tail gate party shelf with folding leg for support. Some people have made their own out of wood and there's also a place that makes them in different kinds of wood, like mine.....
