Anything that you can fit. I wouldn't use the original bulb socket, except maybe as a mounting post. I'd pull the wiring up through the base (because it fits the reel, and has a useful magnet), solder it directly to the LED, and glue the LED to the socket or plastic base.
But I got mine before LEDs were common, so they have good original-type (described in that caption) bulbs in them. When those start burning out, I'll start looking for LEDs - maybe the one YOU recommend!