help with msd wires

[DBYRD]

Bought a set from JEGs no more than a year ago and they stick out right onto my pacesetters and are starting to melt. im worried they may wear all the way through and start shorting out. i know they make sheaths(for lack of a better word) to go over them. does anyone know where i can get them at, or is there an inexpensive way to protect them without cutting corners?
TIA
Dustin