dfconnolly, the armrest is the Original from honda it comes with a plasic cover when you remove the original armrest.
It's not a difficult job to do.
Here is an armrest installed on a LHD car.

My big tip for this installation is to cover the carpet holes when you are removing the screws to replace the metal part for the new armrest Support. Because if the screws fall out inside the carpet, it'll be a pain to recover them.
See on this picture. Where it says "Vedar com fita crepe" reads "Seal with masking tape".
