Hi,
If it helps, to pass compliance, my car just had to have the bars under the parcel shelf. I had to go back to get the holes puched through the speaker covers once I did fit a baby seat. My opinion is that you don't need the clips, just the bars underneath so no real modifications are needed to fith them. If queried, say that the bars are there and that for fitting the baby seat, the bolt needs to be put back in with a clip. I know in our other old car, we had to buy a bolt and plate regardless and it was an AU delivered car.
Damien