I ordered a refrigerator door hinge, hinge pin, and washer. The descriptions and pictures imply that these items are sold separately. However, the hinge I received was an assembly that included a pin and washer.
I replaced the original hinge assembly with the new assembly, but the door still sagged (not as badly as before). I added the washer I had ordered separately and the original washer (total of 3 washers). The refrigerator doors seems to be closing properly now. I still have an extra hinge pin.
Appliance Parts Pros video, which recommended using a block of wood to hold the refrigerator door during the hinge swap, was very helpful.