Yeah I had to bite the bullet and get new rims and tires for my 81 F-250. I got a set regular size rims at the salvage yard for about a hundred bucks. She's still going though

I'd like some help to figure out how to fix my 1981 F-250 351M. I don't know the name of the part I'm trying to replace or how to do it. I have attempted to replace my water pump and found that there is a plate behind it with a gasket behind that needs to be replaced. I can't seem to figure out...