Ah right, just at the front before it goes onto the pipe that cracks?
Is this the correct blanking plate?
https://www.ebay.co.uk/itm/121859879043?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=Rqfw51QjRCW&sssrc=4429486&ssuid=apGsTcWhRpW&var=&widget_ver=artemis&media=COPY