Take the broken one to a hardware store. Not a big box store, the local place where the old guys hang out and make remarks about new-fangled power drills. Ask them if they have something similar, or if they can order one for you.
It's got a warning tag right on it saying something about extreme tension and danger...
I tell ya, I nearly had a heart attack when it broke, it made such a horrific noice and I couldn't see Joshua...I started screaming "WHERE ARE YOU!" (He was between the cars) and Steve said "I'm right here!" Well, I could SEE Steve! I said "NOT YOU! JOSHUA!" Joshua came ambling around the front of the car and said "Well, THAT startled me!"