I took a look at your save in MSCeditor, and it was saying the missing radiator hose should be next to the bed. It doesn't seem to show up in game though. Really bizarre. Having said that, I would recommend downloading MSCeditor and teleporting radiator hose 3 to the driveway.
As for the battery, it's in the right spot generally, but it's not snapped in place. if you pick it up a white check mark should show up so you can go ahead and do that. The reason the bolts aren't on the battery is because you still haven't wired up the car. There are a few helpful tutorials on youtube that can walk you through the steps on just how to accomplish that.
Also, since you already have the racing radiator, just go ahead and install it. It won't prevent you from passing in inspection, so there's no real need to just let it sit around. I hope that helps.