The GM boiler barell is 10.75″ in diameter by .375 ” thick wall.
Boilers are not available directly from AN engineering. Laser cut hornplates are, including the LH plate with a 1″ offset pressed in.
Tony B. (AJB engineering) has been the main source for excellent boilers for the Burrells and model live steam boilers in general for decades and is now retired.
We are very lucky to be able to provide similar high quality and service with: