When I changed the head gasket two years ago on my 300SE I replaced all the freeze plugs, except for the psg rear one with the hex screw and it now starts to leak coolant. Found this at pelican parts, is it the right part for the early m103, would think they are all the same? What's the best way to replace it, I can reach it without taking off the exhaust manifold, but I'm afraid the old plug will break when taking it out because of rust. Any pointers on how to tackle this and keep it simple?

https://www.pelicanparts.com/More_Info/1179970230MBZ.htm?pn=117-997-02-30-MBZ&bt=Y&fs=0&SVSVSI=3353&fbclid=IwAR25SL-qju1fW9Mb4gurnQ4wkBQMDOLc_LLV2GhRuMzkjJdK35ZCu4ToSX8

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).