have a dravo drive and the ground plate is missing, not sure how important it is,the small retaining screw is broken in the case,how important is it and were can I get a couple of those?

Bonding/Grounding items are very important "IF" the boat is in the water and connected to shore power

This is what iam talking about

Yes, its a newer style of bonding. Use to have a stainless wire going from gimbal ring and housing. All for making sure the drive is bonded so the Mercathode will protect the drive when its in the water and connected to shore power