turn signal switch assembly part number

[Alex Hayley]

I am rebuilding a van tilt column and found a post of a part numbers for a turn signal switch and turn signal switch assembly.

Turn signal switch - 1972751
Turn signal switch harness assembly for the above switch - 1894851

http://67-72chevytrucks.com/vboard/s...d.php?t=216068

First, is the harness assembly just the wires that attach to the switch?
Second, are these parts for a van tilt or a truck tilt(perhaps they are for both)? I phoned the Chevy dealership but their catalogues did not go back far enough.

Here is an image of both perhaps: