68 cuda column help

Hello all...I'm trying to put together my column shift steering column after I took it all apart to rebuild it..I have a few questions if anyone has a blow up diagram or know where to get one would be a great help...Another problem is this, here's my backup switch assembly, I think:



And I know it mounts here:



But if you look at my column there is a hole that something sticks out I guess that activates the switch. And when I took it apart, it didn't have nothing there, so I was already missing it...

Here is a pic where I think something should go in this hole to activate the switch:



Any Ideas on what is looks like or where to get it? And why the heck would it be missing in the first place? Or do I have it all wrong and maybe its under that dash or something? I really don't know, but a blow up diagram would really help me. I looked in the Haynes '67-76 book, but it doesn't cover this specific column...

This is kinda holding me up to put it all back together...I'd hate to say the heck with it and just assemble it the way it is, because then I wouldn't have reverse lights....any ideas???