Tom - I was offered 2 different sets of sensors based around the same kit. The first ones were much more like the ones in your link, the ones I have were the alternative (and preferred choice) and they sit much more flush with the bumper.
I spoke to my mate at VW before going to Highdown as I originally wanted VW to supply and fit some, but he informed me that they always use Highdown for these kinds of jobs. According to Highdown, most of the ones he fits make use of the same type of sensors that I've got, as they look better when installed.
Daz