Need original sliding door lock

Hi my wife & I recently purchased a home & The previous owner installed a doggy door onto the rear sliding door. They didn't give us the original lock that attaches to the door frame at the wall. The sticker on the wall says Series AV 450 - SGD R20 99X95. Do you know what part we need to get to replace the original lock on the frame of the door? We're going to take off the doggy door.

Here are more pictures with a tape measure for sizing. Please let me know if you come up with anything. Thank you.