Thanks, I knew there was a hole in the center of that lock panel but no rods or levers, but, I then looked at an extra set I got with a parts door and yes, that one has the assembly attached. Will probably change the entire part rather than trying to swap out the inside openers.
Thanks- I had just seen an old Mayberry show and the guy opened the door on an old PU by sticking his hand out the window- so I thought thats how it worked!