Interior floor wiring channels?

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Hey all. Running some new stereo wiring and I'm going to run some down the passenger side under the carpet just like the factory drivers side has, but the drivers side is the only one with a factory wiring plastic channel. I've google-foo'd and searched, but am not finding the factory style piece anywhere. They have the mini D style on amazon and I'll use it if I have to, but does anyone know where to find the factory style or if it's even available? Thanks in advance
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