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Hi Martyn. We have also got a Seamaster 30 with twin Thornys. If you look at the glow plugs you will see a serial number on the top of the plug (just like a spark plug). If you make a note of this and give it to a local auto parts retailer (A J Auto Parts or similar) they will be able to supply for. We have copies of both the engine and parts manuels for these engines (which I think are up on the boat at the moment) but if you want to borrow them to make copies, let me know. Regards Alan