My car is a 2009 with 65k km . The cover on the rear wiper cracked for no apparent reason . Anyone with similar fate...?

E-Bay is selling them , so it must be a common failure, no???

VW REAR WIPER WASHER COVER CAP TIGUAN CADDY TOURAN new on eBay (end time 17-Apr-11 00:33:40 BST)

I'm too afraid to ask for a price from my local VW stealership , so I'll just order one....