Power Steering Setup for 68'

[BDegs]

Hi all,
I'm trying to install a power steering setup on my 68 302 w/headers. I bought an original setup but it came with the wrong pittman arm. I've searched a lot of the catalogues and suppliers, but I'm finding out that it's a non wearable part (which means that nobody stocks it).

So it looks like I'm going to need an orignal. Does anybody know where I might come across one? Has anyone done a setup on a 68? Any help at all would be greatly appreciated.

thanks,
Brian