Replacing line on Furlex type A- Hunter 25.5

Jul 5, 2017
66
Hunter 25.5 Arizona
My new-to-me boat has a Furlex type A where the PO left the line to rot the last 8 years or so and I'm unsure of the line length required. It appears to be 3/8" line, which I gather from googling is rather large for this type of furler. The .pdf on Seldenmast.com for replacement parts says L=20.00 which might be 20 feet but I'm unsure. I'm thinking 5/16 or 7/16 line and ordering at least 40 feet. Opinions?