The OPC or better known as DRUM unit, is the green cylinder that "prints" the image on the printer. It needs to be replaced to keep the printing quality.
Here is the part that you need to replace if the printer is asking for :
http://www.paperstone.co.uk/pprd_40302_Lexmark-Laser-Drum-Unit-Single-PC-Unit-for-C500-X50x-Ref-C500X26G.aspx
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