Magnum serpentine belt on a LA?

That's what I thought you were saying. So let me be clearer you use a different belt.

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Gotcha. I've seen a different routing when there is no AC and no PS, but no idea what routing would work with no AC but with PS.

To be clear, it does appear that the higher PS mount from a truck or Jeep does seem to avoid the issue. I didn't realize that until I re-read the linked thread. So technically, the issue only comes up when running the van PS bracket.