1982 Sunfish halyard and mainsheet

I recently bought a 1982 Sunfish with what I'm pretty sure are the original halyard and mainsheet. Both lines are off-white color. The halyard looks like twisted 3-strand and appears to be 3/16" diameter. The mainsheet is some type of double-braid and appears to be 5/16" diameter. I was wondering why the original halyard was not also double-braid. When the time comes for me to replace these lines, I'm thinking of trying to find lines that look like these original lines. Would that be a...

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