Just explicitly checking diagnostic features and dimensions showing here, : before confirming this identification:
• Leaves usually 2–4 cm wide ?
• Pollen presenter fusiform shaped, 2–3 mm long ? – in the old inflorescence – infructescence, at the top of this first photograph here, with the original viewed at full resolution and zoomed in to this old inflorescence – infructescence .
(Fl. NSW glossary quotation: "fusiform [means]: spindle-shaped, i.e. narrower at both ends than at the middle." ).
Reference:
• Flora of NSW online PlantNet: PlantNET (The NSW Plant Information Network System). _Banksia_ (page) → https://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Banksia _Banksia aemula_ → https://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Banksia~aemula _Banksia serrata_ → https://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Banksia ~serrata Royal Botanic Gardens and Domain Trust, Sydney. Viewed: 2025 June 10th .