BrickLink - Part 11217pb02 : LEGO Minifigure, Headgear Helmet SW Clone Trooper (Phase 2) with Captain Rex Blue and Tan Markings and Dark Bluish Gray Tally Marks Pattern [Minifigure, Headgear] - BrickLink Reference Catalog
BrickLink - Minifigure sw0194 : LEGO Clone Trooper Captain Rex, 501st Legion (Phase 1) - Dark Bluish Gray Visor, Pauldron, and Kama, Large Eyes [Star Wars:Star Wars The Clone Wars] - BrickLink Reference Catalog