11"
The rear wiper blade is a special jeep-only part so you'll have to go to the dealer to get it. While there, ask for the replacement instructions.
The 2004 Honda Element takes a fairly specialized 12" rear wiper blade that is difficult to find in stores. See sources and related links below for more information.
Wiper Blade Sizes: 24" Drivers Side, 20" Passenger Side and 16" Rear
I do not see aftermarket replacement rear wiper blades nor rear wiper refills listed in the aftermarket wiper catalogs for the 2004 Jeep Liberty. This would possibly indicate that the rear wiper was a proprietary technology/design and you may have to go to the dealer for the parts and possibly labor. Before doing this (because its usually a little more expensive at the dealer), you may want to visit some internet forums and see if there's other ideas out there. Google "jeep liberty forums" then search "rear wiper" once in the forums. I'm sure there's rapport on this topic. As far as front wiper blades, The 2004 Jeep Liberty takes 19" replacement windshield wiper blades on both sides front and aftermarket wipers are available. Note, when buying wipers be sure to always lookup your vehicle make, model and year in the application guide book at the store, or now-a-days you can Google 'lookup wiper size'. You want to look this up because correct wiper fit is more than correct length, it's also proper attachment. Not all attachments fit all arms. Using the application guide or looking up wiper size online will avoid headaches of buying the right lengths with the wrong attachments.
The 2004 Ford Escape takes a fairly specialized 10" rear wiper blade that is often difficult to find in stores. See sources and related links below for more information.
The 2004 Toyota RAV4 rear wiper blade size is a special 12" rear wiper blade that is very simple to replace once you find a replacement. Unfortunately, most stores do not stock this special rear wiper blade. See the Sources and Related Links section below for more information on the wiper blade itself and installation videos. Once you get the wiper blade, there will also be step-by-step instructions on the packaging. Very easy install.
The 2004 Dodge Durango rear wiper blade size is a special 14" rear wiper blade that is very simple to replace once you find a replacement. Unfortunately, most stores do not stock this special rear wiper blade so please see sources and related links below for more information and installation videos. Once you get the wiper blade, there will be step-by-step instructions on the packaging.
The front windshield wiper blades are special dealer-only wiper blades and you must get them at the dealer. The rear wiper blade is hard to find, but you can get non-dealer versions. See Sources & Related Links below for rear wiper info.
The front windshield wiper size on a Dodge Caravan is 26 inches for both driver and passenger. The rear windshield blad is 16 inches.
I do not see aftermarket replacement rear wiper blades nor rear wiper refills listed in the aftermarket wiper catalogs for the 2003 Jeep Liberty. This would possibly indicate that the rear wiper was a proprietary Jeep technology/design and you may have to go to the dealer for the parts and possibly labor. Before doing this (because its usually a little more expensive going through the dealer), you may want to visit some internet forums and see if there's other ideas out there. Google "jeep liberty forums" then search "rear wiper 2003" once in the forums. I'm sure there's rapport on this topic. As far as front wiper blades, The 2003 Jeep Liberty takes 19" replacement windshield wiper blades on both sides front and aftermarket wipers are available. Note, when buying wipers be sure to always lookup your vehicle make, model and year in the application guide book at the store, or now-a-days you can Google 'lookup wiper size'.
The wiper blade is an 11". DO NOT BUY BOSCH 11" wiper blades for a replacement, unless you plan on using your old adapter fitting with the new blade....Bosch does NOT have the adapter to fit your blade, and if you break the original adapter, you cannot use the Bosch blade. I learned this the hard way. I believe that Anco makes an 11" blade that will fit the Jeep Liberty 2002-2004.