I offer a brand new coiled sync lead suitable for Vivitar 283 and 285 flash units. It has a male pc sync connector on one end and a Vivitar jack on the other.

It is brand new in box, (well plastic, actually!) and measures from about 50cm to 80 cm extended.

This item is made by an aftermarket manufacturer, and the quality appears to be very good.

Nevertheless, I have also tested these leads for fit and performance using my own Vivitar 283. Needless to say, they work fine.