Help us, universe, we need this type of headset. Ideas?

Hi all,

We have an antiquated (heritage?) phone system in our office, and we need to find a headset we can use with it.

The phones do NOT have a standard mini headset jack, they have an old fashioned phone jack port like this:

None of the usual places you'd buy phone/computer equipment in town sell headsets that fit these anymore. I'm looking for something that might look like this, with a headphone plug instead of a mini jack:

Anyone seen one of these lying around somewhere, or for sale in St. John's? If you have, email me at ich@heritagefoundation.ca