Gen5DIY offers these 7.5watt 4300k H11 led bulbs. They are very close to the headlamp output of the ZL1. Sold per pair
Step1- RH side. Turn the wheels all the way to the left and remove the 6 torx screws(T20) holding the fender liner to the bumper. There are 3 in the wheel well and 3 under the bumper. Once these screws are removed you will have access to the back side of the bulb housing.
Step2- Disconnect the connector from the bulb and remove the old bulb by twisting out.
Step3- Install new bulb and reattach the connector.
Step4- Reinstall the fender liner screws.
Step5- Turn the wheels all the way to the right and repeat the above steps for the LH side.