I bought a vivi nova 2.5 from a vendor but recieved the older version.The one I purchsed does not have the air hole on the side of the bottom plate.It has the air hole on the 510 connector.I called them and they are willing to take it back and issue a refund,which is great but I have to send it back and thats a couple bucks out of pocket so,Im wondering if I decide to keep it,can I use the coil heads that came with it on the actual vivi nova 2.5 if and when anybody gets them IN STOCK..lol....seems every one is out of stock on these things.It would make since to me to just keep this one for the replacement heads since I got a good discount and only have 14.35 in it with the shipping.I assume I could use the tube as a replacement as well....please someone chime in and let me know if the parts are interchangeable befor I send it back...thank you for your replies