Okay, what are these things called? I'm having trouble finding replacements.
It's a zip tie on one end that will go around a wiring harness and then push onto a bolt or stud. These are off my 2011 GMC under dash harness but I've seen the exact same ones under the hood of my Mustang so they're not make specific.

It's a zip tie on one end that will go around a wiring harness and then push onto a bolt or stud. These are off my 2011 GMC under dash harness but I've seen the exact same ones under the hood of my Mustang so they're not make specific.