Note the SOLID rivets, that are NOT welded to the radius cup, and the cup is NOT welded to the floor. You are much better off this way, as welding it solid will eventually lead to metal fatigue and cracks. These cups are drilled for RH and LH 6-cyl. cars, and also V-12’s. Use 8 rivits instead of the factory’s 6 – they only use one on each side depending on right or left – use all 8…