This oil bunker insert is for the Bachmann "Baldwin Small Stock Tender" That comes with their 4-6-0 & 4-4-0, and is also available separately. It will also fit any flat-topped tender. The rounded top edges and large oil hatch are based on a Yosemite Valley Railroad Prototype. It can also be used for On30 Models as well.
The large Oil hatch is also suitable for On30 Models too.