For my MFC-J4410DW, the parts link is https://service.brother.co.jp/training/all/download/html/attFile/1000056816/pl_bhs13_e_ver20.pdf . Also, I've found a site that claims to have the relevant parts: https://www.precisionroller.com/
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=== Update (04/29/2019) ===
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I've created a [guide|125060|guide] that may help.
For my MFC-J4410DW, the parts link is https://service.brother.co.jp/training/all/download/html/attFile/1000056816/pl_bhs13_e_ver20.pdf . Also, I've found a site that claims to have the relevant parts: https://www.precisionroller.com/