Turn signal parts

[OhCookie]

Hi everyone, I have been lurking on this site for awhile now and finally found the right truck for me. I picked up a 1970 C20 on Saturday and while driving it home one of the things I noticed was that the turn signal stalk and parts are missing. Looks like a previous owner replaced it with some funky switch under the dash, which doesn't work. So I was wondering if parts are available? I don't know how much luck I would have finding parts in a junk yard here in So Cal. Are there companies making parts for these trucks like they do for my 1970 Camaro? Any advice would be appreciated.