Larson Door 1751-1 and 2

It was on a Larson Door. Inside is a lever handle with a small piece turned into a groove to keep the inside level from turning. The outside is a lever handle. A square bolt goes through the door to turn both inside and outside lever handles. The outside cover plate has a part number 1751-1. The outside lever handle has a part number 1751-2. No part number can be found on the inside cover plate or lever handle. The inside lever handle is pulled and a spring loaded catch goes across a plate attached to the side of the door frame. The inside lever handle has to be turned to open the door. The distance between the installation holes is 1 and 3/4 inches.

I screwed the handles back on the door but when I pulled on the inside handle it came out leaving the inside plate still on the door. Is there a schematic drawing so I could see if I'm missing a piece in the assembly before I buy a new handle.