Datsun Roadster & Fairlady Early steering box cap for the worm & roller steering boxes. Production sample shown.2nd photo shows the the two part cap disassembled.
Probably be cheaper at a Canadian Nissan dealership
Sales unit 1 cap for price listed
Like the original, these reproductions are a two part cap which has a hole in the bottom that feeds to a inner reservoir in the center of the cap to capture any gear box oil expanding out of the steering box, which later drains back. It also has an open hole at the top to vent oil if the gear box has been overfilled.