I have an 82 8.5 with 2 mainsheet travelers. One has NEMO imprinted on the car and the other is a Nicro-Fico. In looking for repair parts I came across the
Rig-Rite company and they have Kenyon and Nicro-Fico traveler systems that are the same size and track dimensions. Yours may be the same. It'd worth a look at their website.