I would suggest calling Lee directly for the parts - most stores are not likely to carry the parts.
Try
http://www.leetackle.com/ - I had to replace some parts on mine when some a** rocked me at the
fuel dock and my riggers caught the pilings.
As far as running dual halyards, I assume you have at least 2 eyes up the length of your riggers.
Run the long halyard through all of the eyes and the second halyard at least 1 eue short ( my eyes are
just eye bolts). I have added small pulleys (West marine or similar) at the far ends. It really smooths them out.
For the boat side, I got some shock cord and then a 2 wheel pulley to run my halyards through. after I got the
length of the shock cord right, I put heat shrink over the shock cord to snug up the pulley.
For halyards, I use 400 lb black mono and have crimped heavy snap swivels into each end so I can change release
clips throughout the season.
F