Patio screen door closure
Thanks for your post! The closest replacement match we have for your door closer is the 40-079B Storm Door Pneumatic Closer with Shock Spring. I am not certain that this one would be compatible with your door, so you'll need to review and compare the dimensions and design to confirm.
A few other options are the 40-016, 40-077, and 40-128. These all have 10-1/2" lengths so there is a chance you may need to drill new holes for the installation.
Be sure to take a look over at their compatible hardware on the website. There are a few installation videos and guides tagged below this thread as well. They can also be found below the related products.