VW folk call them Armour Door Plates (ADPs). The real ones cost about £50 from VAG, the cheaper ones start at about £20.
I have the £50 ones, and they don't work. While they're good at preventing the handle being forced from the panel, they are useless and completely vulnurable in another blindingly obvious area.
I had mine broken into this way in London; I was baffled how they got in (no damage anwhere) until the following morning when closer inspection revealed how they did it.
One benefit was there was no damage at all; lost my treasured Bannies, though [img]smilies/frown.gif[/img]