Retractable Cords for Lighting Fixtures

I am working on a lighting project for a client and have been searching all over for retractable cords that I could use in the lighting fixture that I am designing. It seems that the cords have gone the way of the dodo bird. I'm basically looking for a cord that would be used in the same manner as the old retractable lights from the 50's and 60's. Does anyone out there know where I can find these cords?

Here's an example that I found on the great Retro Renovation blog:

Gramercy Tavern Light Fixtures

Gramercy Tavern asked me to design some new light fixtures for their main dining room. Here are some photos of the work in progress and the finished product. 

Light fixture frame (before copper mesh)

With and without copper mesh

All three finished light fixtures at Gramercy Tavern

Finished light fixture, hanging in the main dining room at Gramercy Tavern

Pace University Dorm

Last year I did some decorative work for a new Pace University dorm that was being built. The lovely and talented ladies at Amy Statuto Interiors (the interior designer for the job) sent me some images of the work after it had been installed. Nice! 

Metal panels designed to cover a room divider for Pace University dorm lobby

I designed several wall panels and light boxes for the dorm, which were fitted on every floor of the building

View of the wall panels and light boxes behind the lobby reception desk