The 'E' Type Forum

Groping my way through the sourcing of parts, I bought some Superflex anti-roll bar bushes before noticing that Barratts supplied a complete set of Polybushes for the car. So I now have two anti-roll bar bushes by different manufacturers. What is noticeable is that the Superflex bushes are very much harder than the Polybush ones.
I post this merely as an observation. I have no idea what, if any, is the significance of the different material specs.