god we are talking old just pull the cables through run tape round the cable at top of conduit and slightly pull it in . stop any chafingI can't find these things, don't know what to search for!
They are the rubber grommets that go on the oval "tin whistle" metal tube in many old houses.
Mine are a bit knackered and I want to replace them as I rewire the house.
Not old really BS the wood trunk with single VIR cotton covered is old