Replacement handle

I have a broken latch and loose screws that cannot be tightened. I took it apart and I found a U.S. patent# 5125703 D340,398. This number is printed above the patent# 22650. Can I order a replacement from you? I am also having issues with the piece that locks and unlocks the door. The screws will not stay tightened on that as well. I have tried to find screws to fit, I have tried all kinds of things to get my door to lock, but to no avail. I have bought a replacement but I will have to cut a rectangle slot out of the door to fit it correctly. I need some help with it.
Thank you for your time and help.
Sincerely, Misty