When my son was racing his High School Malibu 350 he thought it would be cool

to take the power steering off and convert to a manual box. Now that he is 40 ish he is finding it hard to park.
Soooo, I have been collecting what I need to go back to PS, all that is left to get is the pitman arm.
Any idea on what casting # I should be lookin' for ? Are the repop ones OK to use ?
Thanks Mike