When I replaced the turn signal and hazard mechanism on my '75, I picked up the part from Advanced Auto Parts. The switch itself fit in the column without any problem, but the plug on the end where it connects to the wiring in the lower part of the column was not made correctly. It is a wide, flat plug, with multiple wire connections, and the spacing on the new plug was off just a little, so it would not connect properly and snap together. I finally cut the connector off the new switch and spliced on the connector from the old switch, which worked fine.
Bruce