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A company called MMR used to make solid (delrin) subframe-to-body bushings. Other than that I'm not aware of any aftermarket options. As far as I know there isn't even a "Mazdaspeed" (i.e. harder rubber) option so stock is the only option. The bushings aren't that complicated so one with access to certain tools could make their own polyurethane or whatever material bushings.
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