I would recommend hardrace as the alternative to mugen or spoon (which are re-branded Oem stuff anyway). HardRace has a track record amongst people who track a lot and having used their stuff, it pretty good. As for copying, I mean how different can you go in design of a bush anyway.
Front Hardrace arm and spherical bearing.
Rear hardware trailing arm spherical bearing.
Oem or hardrace, i'd go hardrace.
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