Not sure -- I know the Bugaboo has a car seat adapter for about $50 that is compatible with the Peg Perego. You just attach it to the Bugaboo and then place the car seat on top of it.
It is very easy. Of course you must have the Bugaboo for it to work. I would suggest calling The Right Start on Lake Avenue in Pasadena -- they will know other options as well.
But I love my Bugaboo.