This Boundary MartenWear-treated billet oil pump gear is specified for 1991.5–2000 Mazda Miata BP I4 non-VVT engines. Offered as a treated billet gear, the listing notes the application to the BP I4 non-VVT Miata engine family and the MartenWear treatment as shown in the product description for compatibility and durability considerations inherent to the treated billet construction.
Boundary 91.5-00 Mazda Miata BP I4 (Non-VVT) MartenWear Treated Billet Oil Pump Gear