Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
No fuser for that model is sold online that I can find. One 'fuser oil, bottle' or similar, is sold. The fuser oil bottle is a different matter from the fuser, need I say.
This fuser evidently has three rollers in it... a complex assembly. The closest thing to a replacement fuser I have found is one of the rollers, only:
This treatise (of sorts) on the DC12 and esp. on its fuser system and fuser oil system, is of some note with regard to your question:
and yes, fuser oil can be needed. What problem does your DC12 display on printouts, that fuser or fuser oil might possibly address, please?
(PS: The company that provided that treatise on the DC12 that I cited above, partsdrop, has a page for DC12 parts here:
in case that information might be useful now or later.)
Let me know what you think, after examining what I have cited and said above, and I will advise you further as and if needed. Thanks.