Latch part for Larson storm door

As per our phone conversation on 11/18 I am sending these pictures of the door latch I need a part for. The part I need is called a "spring pack" which is shown on the picture of the Larson parts list as item # 2, Larson part # 2020172. There are three screws on the inside mounting plate. The distance between the top and center screw is 1, 3/4" and the distance between the top and bottom pan head sheet metal tread screw is 3, 3/4". Hope you can use this information to find the part I need. Thank you for all your help in my search for this part.