Did not realise thread was smaller on 280cc bottles but makes sense.

The carbon bottle saves weight and increases volume over a 400cc. The bottles can be bought from Daystate but only through an RFD that is willing to fit it for you, Daystate will not sell to individuals for DIY fit. The carbon thread is not exactly the same on their bottles, If I remember correctly the thread has a different pitch for Airwolf compared to Wolverine so let them know it's for Airwolf when ordering.