What the Yanks call rockers we call sills, and what they call sills we (I anyway) call kick-plates.
You might consider making your own kick-plates with a piece of sheet aluminium - start by making a paper pattern and then cut and trim the aluminium to suit your car - and even have your own engraving done.
I'm not sure whether Cobras have weather strip on the inner edge of the sill but if not, you can bend the aluminium to cover inside the sill down to the floor.
If you are going with the engraving have it done before you put any folds in the aluminium.
Personally, I can't wait to get some scuff marks on the sills - bring on the patina.
