Though I'd posted this already, but can't see it. If I have --apologies. Recently found while doing the cam belt that the torque reaction bush in the top ally casting (the big round bush) was somewhat tired. Having changed the lower one before now, went along for the upper. Result -- don't do them loose, comes as an assembly -- £82.00 !! The loose bush for the lower one is around £11.00.
Solution --- local warehouse, BX lower bush, aftermarket, less than a fiver !
It's a bit of a game removing the old bush, particularly as you need to be careful of the casting, but for over £70 saving, it's worth a bit of effort.
Can't tell - at least as yet -- any pereceptible difference between the fake and the original in terms of noise, damping etc.
Mike.