Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

If noone steps in with an offer from their parts drawer, i would suggest hunting down a donor engine on Ebay.
Very common to see a damaged Weeden 43, which holds the same heater as the 44, going for next to nothing in there.

Only problem i see, in case that you don´t have a 43 already, you might end up having to buy two...since the 43 is a very nice little engine as well