5.98" × 8.74" Mounting Holes, 300 Lbs Office Chair Replacement Parts Chair Base Heavy Duty Plate Swivel Tilt Control Seat Mechanism for Executive and Gaming Chair 5.98"x8.74"-300LBS is up for auction in Office Products. The current bid is $1.00, 95% below the $19.99 MSRP, in Good Condition. This auction has ended — similar items appear in live auctions regularly.