I cut out my foam and inserted the air hawk cushion in my seat. It works perfect and you can't even tell it's there. My spider is set up just like your explaining you want yours. I can send you some pics if you want. Mine is a 2011 rss. I don't know how to post pictures but I can send on my phone. By the way I think I am going to sell mine. Need a new van. My # 209-740-3228