Wanted. I need a manual steering pitman arm casting #3964881 used on the 5679142 manual box for a 70 Z28. May likely have an "M" stamped on it near the pitman shaft end. This is the same casting number used on the power steering gear but has the smaller manual pitman arm opening. See this thread for more details.
https://www.yenko.net/forum/showthread.php?t=159960
I also need an idler arm for the same. Please PM or email me with what you may have. Thank you.
Rick