Be careful. The black Powerflex are very hard and for track use. The "heritage collection" is dark grey, still good for a standard look I'd say.
yep I can relate to that, the advice given when I had my Cosworth when poly bushing the rear was to do everything except the rear trail arms, oe were still original back then but quite expensive. Like many cossie bits these days now obsolete. Someone did make replicated rear trail arm bushes for Cosworths, iirc it was GGR but never used them myself.
unfortunately when oe bits go obsolete it doesn’t leave you much choice I guess but PU will settle down a bit with use. I fitted a revo anti roll restrictor on my current mk2 focus rs and absolutely hated it when I first drove the car following its fitment, nuff vibration but I’m pleased to say it’s settled down a bit now