I was not aware that they still fitted inner tubes to tyres in the USA.
Having said that, the circumfurance of every tyre needs to be about the same for the systems on this car. If remaining tyres have more than 50% wear I would change all four. Keep the three part worns to be used if the same thing happens again with the possibility of selling a pair on ebay perhaps where you should find a market from people with the same circumstances.