The OE Porsche 911 964/993 chain box covers, like many of the early cast covers, can can susceptible to corrosion and leaks over time. Our 6061 aluminum covers are a direct factory fit to replace the OE covers and are machined to accept factory hardware and gaskets. The machine work, black anodizing, and gasket fitment provides a level of fit and finish above that of the factory cast pieces while staying true to factory part for those wanting a billet part that looks as close to factory as possible. Fits 1989-1998 Porsche 3.6 964 and 993 3.6 and 3.8 engines and are direct replacements for P/N’s 96410510801 (passenger/right side) and 96410510701 (driver/left side) and are designed to use gasket part number 96410518101. Machined in the USA right here in Momence, IL by our skilled CNC machinists.