Where can I buy parts?
In the past it was hard and almost impossible to get parts. In the age of the internet you can google a part number and have many companies you can choose to buy from.
Should I buy OEM or Generic Parts?
I don’t have an easy answer for you. I always use OEM feed rollers. I have been burned by crappy generic rollers. If you have to return and replace them again there goes the money you thought you saved. I like to buy refurbished fusers. Generic copier drums on most of the equipment have worked well for me also. I just ask myself what are the odds this will not work and what is the total cost, even having to return with a replacement. What is the manufacturer guarantee?
Where can I get part numbers or part books or catalogs?
You can google the make and model of the equipment and may find a free download but at a cost of getting a virus or giving your e-mail out and live with spam. I like this service guide source, because they give you the parts along with the service guide for a reasonable price.