Sorry if I have posted this in the wrong place. We have an Oystrt 2 double which currently has 2 puschairs. We are due another baby soon and would like to get an oyster carrycot to use with one of the puschairs. We have a friend looking to sell a good condition oyster 1 carrycot buf I am not sure and am struggling to find out if this would be compatible with the oyster2?