GM Power Steering Cap?

I have a leaking power steering cap on my 04 Saab 9-3 2.0t, and was wondering if i had to order a new part from the Saab dealership as i doubt i can find a damaged Saab at the junkyard, or is there a more common GM car that shares the cap that i can find at a junkyard. A Grand Am or Cobalt or something.

Thanks
 
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