Body Design 46mm ID Smooth Body (Non-Coilover). Collapsed Length (IN) 14.15. PART NUMBER 24-185950/24-191203 BRAND Bilstein. Part Number 24-191203 (2) Rear B8 5100 Shock Absorbers. bilstein set of 2 front & 2 rear shock absorbers for silverado/sierra 1500 4wd.