Years ago I scrounged a set of washers from a '62 to put on my '55. They're easy to swap, but the challenge was to remove the old washers without damaging them. In those pre-internet, pre-repro days they were tough to find but these days you can buy reproductions for less than $10. There are two screws in the escutcheons around the wiper arm shafts. Remove the screws and screw in the nozzles. On the other side of the bezel there are two brass tubes which will connect to the washer hose. Originally the truck would have had a bag for fluid and a foot pump but the system works well with a modern pump/reservoir and a simple pushbutton to activate it.
I can post a scan of the original installation instructions for the 1958 version. It should be similar although most of the info will be related to hose routing and the pump and reservoir installation.