LaserMax doesn't make an internal replacement guide-rod version for the CZ. And the Crimson Trace LG-475 cannot work with the ambidextrous safety of your Shadow.
Unless you're willing to change the ambi-safety on your Shadow to a left-only safety, you're going to be limited to a version of a laser that attaches to the pistol's accessory rail, like one from one of these manufacturers:
SureFire
http://www.surefire.com/x400
Insight
http://www.insightlights.com/products.htm
LaserMax
http://www.lasermax.com/cat_info.php?id=10