Probaly too late for the original poster but a while ago I spent some time looking for the answer to his and hope a reply might be of use to anyone else searching. I ended up with both a MK1 and MK2 kit for the Atera Linea bike rack. They look similar but the MK2 rear door is longer and more horizontal at the top edge and the bike rack mounting bracket is differently shaped. Although a MK1 rack will physically fasten on to a MK2 it dents the top edge of the door. Because of the differnce in the bracket the side rails are also slightly shorter on the MK2 kit. It may well work but given the fact that it was denting the MK2 door I didn't fancy putting 4 bikes onto it, and bought the MK2 kit. If anyone needs a surplus MK1 mounting kit I have one avaialble!