The following Nerf Bars were designed to fit your Hummer H3:
Aries Nerf Bars- $177.95
Dee Zee Nerf Bars- $203.35
Nasta Nerf Bars- $187.95
Steelcraft 3" Round Step Nerf Bars- $169.95
Steelcraft 4" Straight Oval Nerf Bars- $249.95
Westin E-Series Nerf Bars- $188.95
Westin Signature Series Nerf Bars- $217.95
Model years for H3 nerf bars include 2009, 2008, 2007, 2006, 2005, 2004, 2003, 2002, 2001, 2000, 1999 and earlier.