what is the narrowest backless car booster seat available?

Question

We are looking for a backless booster seat for my child to put in between 2 convertable car seats. The seat we have for him now, just does not fit between the other 2. I believe the width we have now is 16 inches. Does anyone know of any brand booster seat that is narrower than that?

Answer 1

http://www.safeguardseat.com/go/index.htm

http://www.totalchildsafety.com/totalch/dept.asp?s%5Fid=0&dept%5Fid=12