i would recommend street unit billet aluminum trany and side engine mounts (it sells as a set) its a little expensive (320$) but its totally worth it , billet is a very strong material so it will last you for ever.
street unit.com / mazdaspeed3 / drivetrain / engine mounts
or you can try this, its way cheaper
http://www.protegegarage.com/product_info.php?cPath=160_447_419&products_id=1524
oh i see, i haven't seen any after market brackets, if you dont want to buy the oem one than you would have to get it custom made for you
I really dont want to get the oem bracket again but I cant seem to find an after market one
i couldve sworn that someone had an aftermarket unit in the works.... i guess they never went through with it. I believe i saw it on PG as an option for the trz mount... but dont take my word for it...