TPMS Question

So I lost 2 of my sensors when I had to get two wheels replaced from an accident because the tire shop forgot to remove the sensors from the old wheels and install them in the new wheels so now I have to buy 2 sensors.



Does anyone know where I can just buy 2 sensors instead of 4? I found a few but they only come with the sensor and no valve stems. Do i need to buy some special valve stems or does any valve stem work with them?



Thanks in advance.