If it's an early Duster, check a couple of things before drilling. Most cutoff switches would only need a small (.250 to .375) hole for the switch shaft. The recessed design of the lens might make it impossible to use a rotary knob, so you'll have to use a push/pull design. You'll also have to drill through the cast housing. A push/pull can be used with a rotary switch if the switch is mounted sideways inside the trunk and the push/pull knob works a lever that's attached to the switch. Typically, Push is Off, which can be irritating if someone bumps it when you're belted in. An old practical joke in the staging lanes, but it can cause trouble...