yeah im restoring a 73 and i had a difficult time with the wiper motor switch. i bought an all new painless wiring harness made specifically for the 73-87 chevy truck and the wiper motor switch had i think 3 different ways it was made, there was the one for just 73, then from 74 to about 80ish and then from then on. then i guess sometime in the 80's it was put on the tree. if you are switching it over to a column thing, does your column have the wiper functions on it or did the other dude replace the column also? i wouldnt worry too much about making it period correct unless you are building an all original parts show truck. anything you buy for it aftermarket will never quite fit like the oringinal parts did. also, if the wiper column control is used, the wires may need to be modified to reach the column?