I bought a replacement battery tray, and bolted it to the foot from the original tray. The tray attaches to the car with 4 bolts into the inner fender, and 1 bolt into the radiator support bracket.

I also bought an anti-squeak kit from the National Chevy Association, which consisted of a few strips of spongy rubber, and some gaskets cut to fit the interfaces between the fenders. The originals were held in place with staples—I opted to glue the new ones in place. I don’t have great pictures of the locations, but the kit comes with good directions.