Powerbook G3 Rubber Feet Set of 4 for Pismo Firewire or Lombard.

These are not the original Apple feet, but they are made to fit precisely into the bottom wells.

Notice in the second picture these have straight edges. 

Personally I like them better than original tapered, since greater surface area contacts surface.

They can be affixed with an appropriate glue (I've used a small amount of SuperGlue).

To save on shipping I send these in a regular First Class business letter, without tracking or delivery confirmation.

Shipping usually occurs within 1 business day.