I picked this up from Amazon and its awesome and fits perfect if you get the X-large. I have 70lbs Pitbull and a 60LB english bull dog that share the backseat and its great stuff.
http://www.amazon.com/gp/product/B00GJ1D13W/ref=oh_aui_detailpage_o01_s01?ie=UTF8&psc=1
http://www.amazon.com/gp/product/B00GJ1D13W/ref=oh_aui_detailpage_o01_s01?ie=UTF8&psc=1