Rear suspension bushes?

I have small problem about bushes in all of rear arms...
it's absolutely impossible to get it here at some parts store, and genuine Nissan costs almost same as another Micra :D
I can order a custom-made bushes for good price from man, who did it for our racing cars, but it will takes about 6 weeks(he need to have an original bushes for a pattern) and I can't be without car for so long time...

Some of these bushes are broken, so I need to do something with that.. Is somebody here who replaced/repair these bushes in some alternative way ?filled bushes by PU sealant? replaced "rubber" by nylon ?
If yes, did you spot some huge decrease of ride comfort ?

Just what you can recommend me in situation when my original bushes are damaged?(and I don't want to get a a lot of money to repair, but want to have a rear suspension in a good condition?)
 
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