This listing is for a pair (2 bulbs) of daytime running lights for your C5 corvette.
The switchbacks are neat because they take on the normal amber color for the turn signal and daytime function but then they turn a crisp white with the parking and/or headlights on.
With the bulbs,a free pair of resistors is included which are needed to prevent the hyper flashing due to less resistance in LED's. Most competitors up-charge another $15 for the resistors.Included with the resistors are quick-connects to make attaching them quick and easy. Resistors are to be mounted away from any plastic or factory wiring due to them getting very hot during use.
A 100% plug-n-play alternative to the resistors (which must be attached to factory wiring), is to upgrade to the hyper-flash harness. The hyper-flash harness eliminates the need for resistors on the DRL's and/or tail lights when converting to LED. It simply plugs right into your factory wiring near the drivers side kick plate area. This eliminates having to connect anything permanently to factory wiring and eliminates the excess heat emitted by the resistors.
Simple plug-n-play install and the results will amaze you!