OE Quality at aFraction of the CostThe #555-40460 cap and rotor are for non-vented spline drive applications, and #555-40461 is for vented pin-drive (Optispark) applications.
The #555-40460 cap and rotor are for non-vented spline drive applications, and #555-40461 is for vented pin-drive (Optispark) applications.