That is your only choice unless someone has one that they are parting out. CDI has no more drums for the 1 series and they have NO parts for the 2 series.
I am starting to look for a new furler as I don't know how long my Reefer 2 will hold up. Maybe 2 more seasons. I'm thinking of getting the Alado as my next furler. Price is right and people seem to be very happy with them.