Isis,
Just like someone else previously said, with the 3" and 4", you can cut it anywhere you like AS LONG AS YOU STAY OUT OF THE HEATING ELEMENT. So you can pretty much cut whatever inch long length you'd like. I pretty much did the exact same thing you're working on, and it's totally OK to parallel wire using just the metal connectors.
Stick your extension plug into the correct metal connectors. Don't crimp it yet though. Then just get some 16gauge wiring and cut your two identical pieces that will connect your first piece of flexwatt to your second piece (Make sure you strip both ends of that extension piece). Stick the extension wiring into the same connectors that the power plug is being plugged into. NOW, you can crimp it with the power plug and wire extensions together. Then you just simply crimp the extension piece to the second flexwatt. I hope that makes sense. I read it over a couple times and those are the most clear directions I could come up with...
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