I just realised that you can actually see the components mentioned below, when they are there that is! (if they haven't previously been replaced they will have disintegrated in the last 30-40 years).
In the attached photo, at the top of the spring you can see all 3 parts, the rubber part that sits on top of the spring, the mild steel plate on top of that and you can just see the bottom of the spacer (yellow/orange in colour).
From what I can see on the parts list the steel "isolator" didn't exist on 408-410 and it has a 411 part number 411-1-23079 (assuming I am looking at the correct item on my invoice from Bristol Cars Services). It's obvious that this isolator would be of benefit to the older cars as well.
Look out for these when buying a V8 car up to and including the 411/412 - I don't know if they are used on any later cars. Cost of these 6 parts when I bought mine in 1999 was about £200 all up, so even accounting for inflation they're not very expensive to buy, although there's a bit of work involved in replacing them.
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