does the traveler car have any name or markings on it?
try looking at shaefer or harken catalog on line to see if the you can match the car to one of their stock items. lewmar makes travelers too.
are you sure the boat did not come standard with a cabin to mounted traveler? if so, just call Hunter.
I have a 1989 Hunter30, and the traveler was move to the top of cabin. The sheaves on the cars are breaking up due to the sun. The track is 1 3/8" X 1 3/8" which is convave across the top. Does anybody know who would be the maker.