Mods made by P.O. What do I have with this engine bay harness?

Thanks this pic is so helpful. What is the tin canister between the washer bottle and the ballast resistor? And is the regulator attached to it? I found one in one of the boxes of crap that was in the trunk when I bought the car. But can't find it now

That silver device on the verticle section of the fender IS the regulator, and the ignition box is right behind the washer tank laying flat.
It's been a few years now, but my 73 Dart had exactly the same layout when I got it as the picture I posted.