The NA/NB Miatas are coming on to 30 years old, with the newest NB's already 15 years old! The bushings on most (all) cars are at a point of needing replacement. Even if the car has zero miles on it, rubber deteriorates over time so they are due for replacement. 
 
Maruha offers bushing kits that replace all the suspension bushings and depending on the drivers' needs, they offer different levels of hardness for street or full track use.
 
We carry the following package:
Mix of OEM + Mazdaspeed Specification (Full metal bushings mixed with some Mazdaspeed bushings)
 
Feel free to send us a message to discuss your needs to determine what suits your needs.
 
Full 22pc metal bushing version is only available by contacting us via Email.