Hi @chrisw15 ,
I think that [http://www.baystateoffice.com/touch-panel-assy-mfc-j6920dw-led448001/|this] is what you’re after.
The part number is LED448001 found in this [https://philips.encompass.com/shop/model_research_docs/?file=/BRO/sm/MFCJ6520DW.pdf|printer parts list] (scroll to p.17).
There may be other suppliers which suit you better. Just search online for ''LED448001'' to get results