Are you in Australia? (Your Brommie pics are...) If so how did you source the bush?
Yes, Bungendore outside Canberra. However, I sourced the bushes when I livd in Queensland, at a Gold Coast wrecker (Pacific Motor Wreckers I think) that had heaps of Matiz cars. (I use the bump rubbers in other applications as well so I got a few. However, I just checked and I have only two left - and one will go in my wife's Birdy when we get it. The other I'll keep as a spare.)
I have that in my Mini as well with enormous benefit over the original spring.
The hydrolastic system was even better - I run a self-built variation of hydrolastic on my recumbent trike.