Ah ha! VIN helped. It was hiding in plain sight!
Sep '06 on Ebay in Newville, PA.
Jun '10 on Ebay in Moorpark, CA.
Apr '13 on Craigslist, Imperial Beach, CA.
I haven't come across it since.
I think that part # is a new one for a part that went NLA years ago.
The original part # is 51 21 6 454 224 and that is shown (old parts book) for all Euro (incl Turbo) & US '02s except the 1502.
My first '02 (Oct '70 Euro LHD) had these on, but I have never seen another '02 with them.
His 35k orig miles is a bit of a stretch. Ex Oldenzaal Classic car and they said 135k km (84k miles). Prior to that it was in Italy complete with roll cage & Black interior, so assume it has been used.