The steel head is the standard piston and the aluminium head is the match piston and the steel head piston would be
fitted to the base models HWSM and 55s and the aluminium head piston would be fitted to the HW55T,HWMM and 55M
models.
Registered User
The steel head is the standard piston and the aluminium head is the match piston and the steel head piston would be
fitted to the base models HWSM and 55s and the aluminium head piston would be fitted to the HW55T,HWMM and 55M
models.
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