Youre on the wrong page, you want INTAKEhttps://www.cmsnl.com/yamaha-fzs600-1999-5dm4-england-295dm-300e2_model40919/partslist/0011.html#results
https://www.ebay.co.uk/itm/351672683287?_trksid=p2060353.m2749.l2649&var=620648046464&ssPageName=STRK%3AMEBIDX%3AITI got the 4mm ones