Looking for info on Van tilt column

[Rreemo]

My truck has been retro-fitted with a tilt column out of a van - appears to be late 70's - early 80's era.

My blinker return switch has never worked, and now my blinker arm has come loose. Pulling the steering wheel revealed that the small set screw that holds the arm is stripped. I think I need a new blinker switch too, but would like to see a diagram on this thing if possible....trying to figure out what all will need to be replaced.

Anyone havine information on these van columns?...and/or know if the parts for these things are available through places like Napa?

Thanks.