Looking at the wood ,I would simply go over it with cutting compound and smooth varnish. Then once it's smooth give it a go with regular car wax or good quality furniture wax . often,as long as the varnish is still original it will come up like new .
The chrome vent is for aiming defrost air at the side windows and the W111 sedan (finny) and very early W108 250S sedans have the same part. it's very common and i've seen them on ebay.
Make sure you get the spring clip with them.
I have a Coupe in the same colour (DB 173) ( in a container,somewhere between Florida and here) and i am thinking of going with the Anthracite metallic version of that colour.(DB172)
There is an excellent site in Germany (where else) that has all the upholstery codes.