Anything w/ PED is just Packard Electric Division of GM and later sprung off as Delphi later bankrupt and sold to many others.
Nearly all connectors and wire plastic parts in Fiero have PED somewhere on them.
12 here likely means little or nothing.
Speaker wire is Not 12 gauge/awg.
Fiero and all GM Wires are metric sizes not awg sizes. In this case 0.
See my Cave, Wire Reading
GM use these clips to make the car fast w/ less labor at factory.
You don't need them and simply use nylon "Tie straps" or whatever is handy. Just make sure metal you tie to don't has shape edges to cut into the wires.
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
The Ogre's Fiero Cave