I seem to recall seeing one or two people had swapped out one color bowl for another, so I'm guessing there might be some bowls around but perhaps not a red one.  If you are willing to go with another color, you might want to mention it.  Also, you might be able to get a matching bowl & lid in the same color easier than finding just a bowl for a red.  (Just a thought). 

Also, I seem to recall someone had made brackets that could be attached to a standard kettle (probably requiring some drilling of holes) to allow a regular kettle bowl to be used on an SSP.  I don't recall who or if they were available for sale. 

Maybe this will ring a bell for others. 

Good luck.