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Looks like they fit...any idea where I can get an ATX50 faceplate or 2?
You have listed two different models of Apeks the TX is larger than the ATX. Have you actually tried any of these? You need to be careful of purge button clearance I have not compared side by side so am unsure about this. Any Apeks dealer will be able to order for you. If you have no joy PM me. Good luck.
may I ask why?
Definitely try 1st hand before you buy, the face plates are not cheap. If you can actually try then it's worth a shot if that's what you want but I reckon it's bit of a gamble based on pics alone. I know there are some people on this board who own both hopefully one of them will spot this and chime in. Good luck.
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To add, the TX is very large, the ATX a little smaller and the XTX smaller still.