Looking for a thread in Gear and Rigging July 8 Sunpath used to have a retrofit kit. Size of harness is not a factor, but yoke size is. Must supply info- yoke A - B or C. (Helps to have a long soft stainless wire /steel "probe" gizmo to get it fed thru. Stainless steel wire is pref because it has lower friction and is very malleable. I made one and converted a few of them. Doubt I still have it.). Just follow instr in the kit info. as Golerk said. The hard part is the tight fit behind the neck area. Takes a bit of patience. I wouldn't use salvaged parts unless Sunpath no longer has kits to sell. My recommendation , after you have installed the new cable housings, get a new Sunpath Phat Daddy cutaway handle. Has a big round wood or plastic hard inner piece in the handle for a superior grip. Then follow Sunpath trimming instr. for the Lolon cutaway cable ends. Must be punctilious in this trimming measurement. Be perfect in trimming.