HPE rear tailgate roller blind and mystery holes!

[VXdeMayo]

Dear all,
whilst checking out the  rest of the interior trim on my recently acquired HPE VX I noticed that on letting the working roller blind retract normally to its plastic stop etc, it continually got caught on the visable painted metal of the tailgate interior. Adjacent to both of the plastic pull stops of the blind are two "largish" holes that have been there since manufacture. It looks as if there once was a pair of plastic or rubber stop blocks/buffers positioned here to stop the blind "over retracting" and getting caught up in the metal structure? Can anyone enlighten me and does anybody have these small parts?
Thanks, and looking forward to attending the 40th Anniversary Beta Gathering in Norfolk!
Chas, VXdeMAYO.