Spinnaker track identification

[Peter]

Trying to ID the spinnaker track on my mast, ref photos, have attached but not sure if they can be seen .
Looking to extend it with an additional length/lengths so I can have a mast mounted pole (whisker). Existing track does have a car mounted.
Looking to extend before I consider removing it and replacing with new, track and car (cost of doing this option).
The boat and mast are from 1983 and built in New Zealand.

Any help would be appreciated, even a link, suggestion to supplier, manufacturer, etc.

Thanks Peter

 

[CrikeyChris]

Selden spinnaker track profile is similar - one is 25mm and the larger is 30mm wide so similar to the dimensions in your photo.
Look on page 154 of this pdf document http://www.seldenmast.com/files/595-808-E.pdf.