I think you might be misusing the term "sheet." The sheet is not the sail itself. Rather, it's the line attached to the clew of the sail. On your boat you have two jib sheets
and a mainsheet.
Your boat is small enough that many would opt not to install roller furling
on the jib
simply because it's so easy to hoist and douse a sail that size. One thing to realize is that if you went to roller furling
, you'd either have to purchase
a new jib or have a sailmaker
replace the hanks that you use to attach the jib to the headstay with a boltrope used to attach the jib to the foil of the furler.
I doubt you'd be happy with any furler sold used. To begin with, it would have to be the exact size of your headstay. Chances of finding a decent one the proper size still in working condition are negligible.