I will say a couple of things about this thread
Buy new as old ones pop off very often and seem to only clip in correctly once (the push in covers are even worse!)
£36 for the insert

(my local dealer sells them for about £25 complete with ends..even ecp sell them for the same!)
my local vw dealer is about 25 miles away (t.b.h kells F17BAD dealer is possibly my closest..) so 8 miles is worth a bike ride if you can't get there any other way