I just drove over to where my car is . Here is a picture taken thru a window in the spokes in the wheel. The wedge or key with the spring goes to the bottom. If you have the key in the spring will fit. The key has a edge that sticks up and the spring goes against it. So you have the key in that means the spring will fit. You are going o have to pry the caliper around to get it into the right position. The key and spring will then start in at an angle. As you tap in in with a hammer it will straighten out and slide the rest of the way in. Its going to be a tight fit so it does not rattle. Its not hard to do but will take some effort and finesse on your part to make sure the caliper is in the bracket to start with.
Picture needs to be turned a 1/4 turn counter clockwise to see it like its on the car.