Find Input Part OEM number or machinery model THUMB Select model THUMB Caterpillar parts: For full view, you need register HYDRAULIC THUMB HYDRAULIC THC (2012) HYDRAULIC THD (2012) STIFF LINK THUMB STIFF LINK 7JW (2011) UTILITY THUMB UTILITY 9X2 (2012) online parts diagram catalog Search for genuine and aftemarket cat parts.