Any half decent hydraulics shop will have 3/4" suction or low pressure hydraulic hose. Do not use undersize hose anywhere in the system.
There's nothing special about the rivets used to secure the rubber isolator pads other than they are steel, not aluminum or some other soft metal. You can use machine screws with lock-nuts if you wish. Perhaps Home Depot, Lowe's or Ace will have steel rivets in stock but you will need a rivet gun to apply them.
There's nothing special about the rivets used to secure the rubber isolator pads other than they are steel, not aluminum or some other soft metal. You can use machine screws with lock-nuts if you wish. Perhaps Home Depot, Lowe's or Ace will have steel rivets in stock but you will need a rivet gun to apply them.