These shocks are included in all 1999-2005 Spec Miata suspension kits. If you are searching Mazdaspeed for this part, the Mazdaspeed part number referenced within the rule books is: 0000-04-5225-BL

These Bilstein Shocks are the specified shocks included in the Mazdaspeed Spec Miata Suspension kits and what is required for Spec Miata competition in SCCA and NASA. 1999-2005 Spec Miatas must use the Bilstein shocks from the 1990-1997 Miata.

Bilstein high pressure gas montube shock absorber. The superior damping ability helps improve handling and stability without sacrificing ride comfort. Instantaneously self-adjusting for changing road surfaces and their performance does not decline from age, use or heat. Heavy Duty setting fits all models except 'R'.