Thats a great idea for these cars, its a useful accessory. My 280ZX had one of those from the factory, it was mounted back up on the firewall, just inboard of the brake master cylinder and the cord was plenty long enough to reach up to the front of the engine bay. The fixed part of the housing had a little toggle switch on the back, simply flip the switch, grab the front half of the housing, twist, and the whole thing came out on the cord. If you're not a freak for originality you could probably get one from a Datsun/Nissan restoration parts supplier, as I think all the later Z cars used these things. Maybe Lucas made the one that Datsun/Nissan used?