I use the Backless Turbobooster from Graco. It seems to fit pretty well. We have another version that flairs out at the base and it doesn't work well at all.
I have two car seats in the back of my IS-F one rear facing Recaro, with a pool noodle under to level it, behind the passengers. I've 5'10" and seat there sometimes and it's comfortable. I'd recommend this protector though http://www.walmart.com/catalog/product.do?product_id=6487077
Oh man do I crap my pants when I put a booster seat back there!!! I'm scared that one day its going to puncture the leather and you'll hear my screams from the four corners of the Earth!!lol
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