From the manual which is on site for silver and gold members.

Interesting fact - the stands for the S120 have the same bracket spacing as those on the S45-2 etc. Different height - I attach a picture of S45s on the normal stands and also S120 stands. You can fit S120s on S45 stands though the rubber stop tends to go to the DIN connector! Shows why having it to one side makes sense! The MS150s are really annoying

I think this what you are looking for.

I think my Mac did that one! It sneaks them in when I am not concentrating!! Service!

Axel offers a surface too and will replace snapped cantilevers.

They are cushioned rubber cylinders - As you know, the transformer on that 4400 has a slight hum and this was amplified by the wooden surface. The cylinders reduced it. Four half squash balls do much the same!

Actually S22s! Lovely little speaker and beautifully made!

I think it is a device so that you can use Beolab 5s. Normally one has a Low Frequency Effect channel - this needs to go through the BL5s.

I am afraid it may be a difficult task - the 4401 is very rare - I have never found one - a friend found mine for me and I know of just one other.

You can restore the cabinets fairly easily - just takes a bit of elbow grease. Look in the Jarman's book and it shows you how. If you do it will wire wool, remove the drivers or the metal will get into the magnets!