These are BVC replacement for other Aspire products but NOT the Nautilus. You can find the ETS glass here.
These are the new replacement atomizer heads for the Aspire ET-S BDC. Aspire certainly took a page from the success of their BVC atomizer heads for their Nautilus Mini (which were backwards compatible in the full sized Nautilus), and have implemented them for the more compact ET-S.
These come in a pack of 5 and are available in 1.6 Ω, 1.8 Ω, and 2.1 Ω