2009 Prius Rear seat cover installation help

I have a 2009 Prius and want to keep my leather seats in good shape as I am pretty "rough" on upholstery and carry computers and accessories in the back seat. I purchased front and back seat covers. The Fronts went on fairly easy but I can not figure out how to do the back seats. I have seen one thread here that talks about some "eye" hooks to release the bottom cushion of the back seat on a 2008 Prius but I don't see these "eye" hooks on my seat. Has anyone had any experience removing the bottom seat cushion from the back seat? The back seat is a 60/40 split bench seat. I have tried pulling up on a corner of the bottom seat and it starts to pull up but it looks like it is just the foam part of the cushion and not actually the whole seat. Thanks for the help