Hi good morning,
Yes you can replace that part. If you are handy and are careful you can do this with maybe some advice from me while you make this repair.
The best place to order the replacement roller(s) is: http://www.sparepartswarehouse.com/Brother,Printer,Parts.aspx
I would call them to order the roller, because not all parts are listed on their site;-)
toll-free number at 1-***-***-****.
When you have the parts, you can reply to this message and I will respond to you to help, no additional cost. Please rate my service to you kindly at this time, so I can place your question in my priority list so I will know when you reply to me;-)
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Thank you and have a great day! Tech Michael