This site has both front and rear door kits listed:
http://www.trucktechniques.com/jimmijammer.html
GM Hummer H2 2003-2006 SUT 2005-2006 WITH LOCKS ON BOTH FRONT DOORS JJ-021200 $44.95
GM Hummer H2 2003-2006 SUT 2005-2006 WITH LOCKS ON DRIVERS FRONT DOOR ONLY JJ-021205 $44.95
GM Hummer H2 2003-2006 SUT 2005-2006 REAR SIDE DOORS JJ-021210 $44.95