The Supertrack was before our time as they say and so much have been discontinued prior to 2000.
Where spare parts for curtain tracks are discontinued and no longer available we would always recommend a new track.
However for those of you who wish to mend and make do you will be able to substitute the Harrison Drape Super Track brackets with a combination of the Universal Dovetail Bracket and Fine Style Pelmet Spacer.
Note you may need longer screws to secure the brackets.