I've got an identical problem to Joe (Sorry to bring it back to life however!)
Was quoted £4.20 for the correct clips today by Autohaus, but the guy on the phone was cautious and said I'd have to rip out the current clips 'leaving big holes'?
Surely the new clips will cover up any holes?
His confusion has confused me. Surely it must be a straight swap by lifting the carpet?!
Cheers,
Pete.