ATI PERFORMANCE SUPER DAMPER Harmonic Damper [OUTER DIAMETER 5.67 (25% UD) | SHELL MATERIAL ALUM | RIBS 6 | 4 RIB REAR PULLEY | HUB MATERIAL STEEL] (GM LS) : COLORADOSPEED - LATE MODEL DOMESTIC (AMERICAN MUSCLE) | IMPORT (EUROPEAN | SPORT COMPACT) AUTOMOTIVE PERFORMANCE PARTS