Question about helmets

Hello, I was wondering if someone could help me. I have designed a helmet to use in assetto corsa and overlayed it to fit onto another helmet which Is already in Assetto Corsa (in photoshop) and I cannot for the life of me figure out what DDS settings to use on the new Nvidia DDS exporter. Does anyone know what I need to tick to get it to work. If you could help me out I would be over the moon.
 
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