I haven't seen any sites that carry lowering springs for the Vibe but they have them for the Matrix, I guess the question is "will those springs fit the Vibe"
There are plenty of lowering springs available for the Vibes, and most of them are listed as Vibe/Matrix as they are the same. There are 2 diferent sets of Eibach(Pro-kit, and Sportline), 2 of Tein(H-techs and S-techs), TRD, Ground Control, Hotchkis, and a few others I'm sure I'm just not thinking of. Click on SEARCH and type in springs or click on view of the search I already ran. There are others too.
Jason Damron, San Diego, CA, Supercharged 2004 Vibe base - Gone to the wind My Vibe pics on Cardomain2009 Chevrolet HHR SS!