408 power window wiring problems

[Sterly]

I'm currently working on a 408 and I'm trying to get the Piper electric windows working. The wiring is in a bad way and needs replacing but I need to get a wiring diagram for the window lift system. The diagram in the workshop manual unfortunately doesn't include electric windows. I've got a diagram for a Bentley of the era that uses the same system, I believe, but that doesn't include the windows either! Can anyone help?

Also, the wire passing through the A pillars is very flexible (steel?) multistrand for obvious reasons. I've been unable to find anything similar. Any ideas what I can replace it with?

Thanks for any help.
Mark