What ArmyRover is saying is -- the Hella 7" lights are lights with replaceable bulbs. Back in the day, (like the 90's when RRC's were new), a lot of cars in the US still used sealed beam headlamps, because the USDOT relied on rules established in the 30's on proper lighting.
That said -- lamp housings designed for halogen bulbs should not be used with HID bulbs. The focal point is different, so the light will not be projected correctly, and you'll be blinding oncoming drivers.
Nothing makes me want to get out the baseball bat and play a little headlight fungo like some numbskull with a flaring set of cheap-o HID's in their car.

I take it back -- I feel even more that way when the numbskull is also blasting the fog lamps. That makes me want to hook up the winch and rip the entire front of the car off, and the flog the owner with the parts.
If you want better lighting for your RRC, swap to a set of Hella's with decent halogen bulbs. Leave the HIDs for cars with properly designed HID lamps, don't be a ricetard.