I hand the repairman the assembly, and he says something like "oh good, you have the right one. It's always nice to have the right one." It takes him no time at all to install the item - he just snaps it into place and snaps on the electrical connectors, and hands me the bill, which I sign. My last memory before waking up is of a close-up of the windshield wipers, showing bright orange push-on electrical connectors about halfway up the arm of both wiper blades.
** this is the same ladder from my Judy Garland dream a couple of nights ago, but I didn't realize that till I started writing this.