You will need a 4:1 VOLTAGE balun at the feedpoint and a 1:1 CURRENT balun at the ladder line to coax transition.
Radio Works sells the bits and pieces you will need as well as fully assembled Carolina Windoms. http://www.radioworks.com/
A suitable 4:1 voltage balun is the Radio Works B4-100, B4-1.5K or B4-2K. A suitable 1:1 curent balun, or as Radio Works calls it a Line Isolator, is the T-4 or T4-500.
Their catalog lists the antenna wire and ladder line lengths you will need. And you need a bit of 450 ohm ladder line.