My '67 Overlander has the original Dometic reefer which is now 50+years old. Some years ago the flint striker wheel wore out and no part was available. My son went on line and found a water heater "re-igniter" with a spring loaded manual switch which generates a spark from a 12 volt
source. I installed it near the front and under the reefer and ran a wire to a grill electrode mounted next to the burner close enough to spark to the edge of the burner. The flame lights when I trigger the switch on the re-igniter while holding the button for the pilot. Prior to that we had to open the outside access door, remove the wind baffle and use a match which required a second person to hold the pilot button inside.