More than likely the nylon bushing has failed that connects the linkage rods together. It is a one dollar part that is designed to allow for slippage when the wiper blades are frozen to the windshield. Over time the nylon deteriorates and will eventually fail. They are a bear to get to and even harder to replace. While they can be changed with a big screwdriver/prybar and/or channellock or vise grip pliers I suggest checking with a local Chrysler/Dodge/Plymouth dealer as they have a special tool which pops them into place. Most dealers will only charge you a few bucks to do this and will save your fingers, blood, and curse words for another day.
It doesn't
Around $15,000
Assuming that you mean "wiper blade" (blade and frame) which are replaced often rather than "wiper arm" (piece from the spindle at the hood to the wiper blade) which are rarely ever replaced, the Chrysler Fifth Avenue has the most common hook-end wiper arms. See sources and related links below for installation videos. Also, purchase the replacement blades first and there will be additional instructions/illustrations on the replacement packages. Locate and press the tab or button where the wiper blade is inserted into the hook of the wiper arm and pull wiper blade out of hook. You may have to rotate and flex the blade to make enough clearance for the hook to pass through.
87 Octane unleaded
1187 bulb
passenger side fire wall
Depends on overall condition, mileage, options, etc...
not unless someone customized it to have fuel injection.
It's located in the trunk under the carpet of the back seat
Try Auto Zone.com
The engine computer (next to the battery) is also the regulator.
18 Gallons