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Hi Dave, thanks for getting in touch, I'd be happy to help if I can. The Fuser is the maintenance part that melts the toner powder onto the page at the end of the printing process and the imaging unit is the metal cylinder that distributes the toner on the paper before it reaches the fuser so, they are 2 very different things.
Unfortunately, we can't currently get hold of the correct fuser for your machine, I have had trouble even finding which product reference it comes under, but I think that it is JC91-01034B. Your printer manual might give you the right reference.
If you haven't had your printer too long, there's a good chance it's still under warranty with Samsung, so it might be worth checking with them. You will get 12 months with your printer when you buy one. Sorry I couldn't be a great help!