Aluminum storm door handle and lock

Unfortunately, we are not able to supply this lockset anymore. We discontinued it years ago due to a high number of customer complaints regarding the quality of its make, and the manufacturer went out of business themselves just a short while ago. 

I do not know of any company who still sells this part, but to be honest it's not worth buying even if you do find someone who does. It will just break after a month and you'd be in the same position you are now. if I were you, I would contact a locksmith to see if they have the ability to adapt something else to work on this door.