This is the typical fan motor mounting post part found in many PS1 and PS2 railking and premier O gauge engines that is seperate from the heater mounting post. It's shaped like a bowl with straight edges. It only mounts the fan motor and the fan impeller spins inside of it. Only need the actual metal mounting piece because I have run into a number of engines with zinc-pest on this one part and I have tons of the heater mounting posts in stock.
If you have this part alone and are willing to "part" with it (please email me), or if you can give me an item number for just this part I'd like put an order in with MTH. All I see on their website are part numbers for the entire smoke unit ($50). Don't need the whole smoke unit assembly, just the one component.