These are the parts you are needing. It's a seal and cushions the the curved brake rod against the underside of the floor board.

http://www.americanclassic.com/images/FL139.jpg

Concerning the seller of your truck. While you're not likely to purchase another truck anytime soon, many, many members of Stovebolt volunteer to personally check out a vehicle for any/all members if it's in their area and give a fair description beyond the sellers. It's too late now for you, but others may want to know this.

Drew