Had a v similar experience wrt the fuel pump cam follower, at vw main dealer on the Wirral.
What is that? Why would you want to change it? Never heard of any problems, and had never sold the parts to anyone else!
Is it some sort of plausible deniability/emperors new clothes type strategy on behalf of vw? Are there just too many numptys employed?
People still knock the 70's British Leyland mentality of letting customers develop/beta_test your products for you...it is obvious that VAG have been doing a similar thing for years.