Around 1984, Commodore transitioned from using round LED bulbs for power and drive indicators to rectangular ones. Some of these could be quite wide, like the ones pictured for a 1571 disk drive. They measure about 15mm in width and have four through-hole leads. C128 uses the same. Some Amiga gear has smaller rectangular LEDs, and some same size as pictured (A500).
Where can replacements for these type of LEDs and similar rectangular varieties be found? (Looking on parts sites I've only seen two and three lead versions of smaller size).