The piece of foam under the driver side seat cushion for a '98 RAM. Mine has completely collapsed and sitting on the metal is not so much fun..OEM=$700 Can't find one anywhere!! Thanks!

 

Try an auto upholstery shop. They can probably make one for you for much cheaper.
None at the junk yard? They would probably make you buy the whole seat but even if it a different colour fabric you could still use the foam. It's easy to change just the fabric cover over.