Hi Chris,
I'm glad to help here! The Aspire bottom Vertical Coil Replacement Head for Aspire K1/CE5 is too small for the Nautilus and Nautilus Mini tanks; however, we do carry the coils for the Aspire Nautilus and Nautilus Mini. I'm posting the link below.
http://www.smoktek.com/Aspire-Nautilus-Bottom-Vertical-Coil-Replacement-Head_p_1167.html
Best regards,
Brad