The Quad-Lock website, www.quadlock.com
, lists three dealers in Mexico - Baja, Puebla, & Sonora. Even if you use another ICF product, I imagine any one of them would be able and willing to provide that information, or at least point you in the right direction. The dealer/installer in Baja has just completed a fairly large project, which was highlighted in a recent issue of ICF Builder. Follow the Locate Dealer link to find the names and addresses.
Also, you could always call Cemex directly, http://www.cemexmexico.com/index.asp