Here's a near exact match to the original roller catch used on screen doors on vintage Airstream and other trailers like Aristocrat and Oasis.
Catch is 1-7/16" W x 1-1/8" L. Mounting holes are approximately 1" apart.
Catch is 9/16" at the tallest point from mounting surface.
Comes with corresponding plate, which you may or may not need. Does not include fasteners. Mount with wood screws or rivets from the hardware store.