The front lifts have Smaxx stickers and it states they are "Suspension Maxx" brand.
(When did Smaxx switch to aluminum spacers instead of the plastic ones?)
The rear lifts apparently are McBay brand... but it's only because we share the rear perch design with all of the following vehicles:
CHEVROLET
* 2001-2009 Avalanche 1500 (includes Z71)
* 1978-1987 El Camino
* 2003-2006 SSR
* 2001-2009 Suburban 1500 (includes LTZ & Z71)
* 2001-2009 Tahoe 1500
* 2002-2009 Trailblazer 2WD & 4x4 (includes EXT)
BUICK
* 2004-2007 Rainier
GMC
* 1978-1987 Caballero
* 2002-2009 Envoy 2WD & 4x4 (includes XL / Denali)
* 2001-2009 Yukon 1500 (includes XL / Denali)
HUMMER
* 2003-2008 H2 (with rear coil springs)
ISUZU
* 2003-2008 Ascender
OLDSMOBILE
* 2002-2004 Bravada
SAAB
* 2005-2009 9-7X