Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
The rubber cover looks to be the same used on the end of the starter motor cable, might have one of those. Can you measure the mounting rubbers Phil, I have some that have no dowels in (most likely mine off the rear number plate bracket) and some that do have a dowel but the dowel is longer than the rubber so it sticks out a little from it. No idea where they came from but I have been stripping some USA parts so they could have come from those. How thick are they and how long is the dowel.
Here yer go chaps.....https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313&_nkw=403821508710&_sacat=0
Try ebay item 403821508710 dont ask for link i cant do those on this dumfone!.Look similar and cheap enough for a punt