When servicing the headlamp ballast on a 2005 Corvette built between August and September, 2005, it is important to inspect the ballast before ordering and replacing with a new part. Some 2005 vehicles were built with a 2006 ballast.
Ordering the 2005 ballast based on the parts catalog may not provide the correct ballast to fit the vehicle's application.

Inspect the ballast to determine the number of mounting tabs, and order accordingly.

2005 ballast has 3 mounting tabs order 2005 p/n 12335922

2006 ballast has 4 mounting tabs order 2006 p/n 89025794