Semi Trucks with Seats Inc. Chair (2005-2011) Placement of Mount: Attaches to upper section, left hand side of passenger seat. Base is designed to match contours and align with existing hole patterns for ease of installation. Drilling Requirements: No – uses existing seat bolts Seat Configuration: Bucket Pole: Included on base Weight: 8 lbs. Material: Powder Coated Steel Dimensions: A = 16.375″, B = 8.5″, C = 12.75″, Hole Center = 6.75″ and 8.25 Features: Quick installation with no drilling needed. Rock solid construction with a lifetime warranty.