Working on a 67 Imperial at the shop. Noticed the power steering pump really vibrates if I raise the rpm. Took it off today, one of the two brackets is cracked. It has a generic bolt being used in the lower pivot location and I was told it is missing a rubber bumper between the brackets. My question is about the bolt, is it a special bolt? Perhaps a one with a positive stop so it can’t be over tightened. Anyone have one for sale?