T.T.
This is what we have...it isnt like the Car Seat 5 pt harness...but works pretty well. It has straps over the arms and a lap belt. This is what ours looks like but in Aqua...we got it at Babies R Us. It is very light weight, sturdy and easy to fold up and down.
http://www.toysrus.com/product/index.jsp?productId=2609029