He hasn't posted back, so maybe you are all set. When I got my '79 H16, I bought cheap rope at Home Depot to get the boat rolling and learned to sail. (some will debate that I ever learned to sail)
Then over time I started replacing it with good line from the local Hobie dealer and online. The Home Depot stuff is fine for starting out and let's you figure things out. The biggest drawback is that it wears out faster and has some stretch to it.
It sounds like in your original post you were taking about the Jib travelers. I also have the old ones, and they do probably have different length than the new traveler system. Again, I think the easiest way is to get cheap rope and install it long, then cut it down over time. Just be sure to leave enough length to go out on the trap and still control everything, especially downwind when the sails are all the way out on the other side of the boat from you.
Enjoy, and welcome to the addiction!
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Steve
2017 Hobie 16 "Cayman" sails 114795
1985 & 1973? Hobie 14 "Sea & Ski"