Passat mirror parts help.

Some friendly so and so has decided that driving too close down a narrow lane was their plan this evening. Queue me searching the net for mirror parts. Light, folding and heat functions all work fine. Top cover is completely missing, so I'll definitely one of those. Also the black lower section under the Indicator lense is cracked with a hole.

I can buy covers for not loads of money on the bay or wherever. Struggling to find even what the lower part is called let alone a supply of one. Could any offer help on this? Can get a whole mirror for £100+ but don't want to do that if I can help it.

TIA