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here's a couple pages from a UK press release for the mazda 121. i thought the last sentence on pg 13 about the rear beam bushings was interesting. at least it explains why there is an F and R molded into the face. maybe that's also why they are impossible to find from an aftermarket supplier. i would think it be tricky and expensive to set up a machine to make a solid bushing more rigid on one side than the other.
