Newly manufactured replacement feet as close to the original size and colour as is possible.
These feet are not exactly the same as the original Atari 2600 feet, but they are as close as it is possible to get.
The originals were a straight sided circular disc, vertically stamped out of a rubber sheet.
These replacement feet are the same base diameter, but the top diameter is very slightly smaller giving them a slight taper, making them appear a little smaller. They are also not quite as tall (but less than a mm shorter), which means that you would need to change all four feet to prevent any rocking of the joystick in use.
Once fitted they look virtually identical to the originals.