Age of AF with S15?

See also thread in Stoker section. Don't know if would have been better suited for this section?

Stoker: S15, serial 11508

Furnace: AF, serial 7762

Are parts for the furnace side of things available?

Also, I see in the parts breakdown above (THANKS MUCH for making that available!) that there are 2 sizes of AF furnace. How can you tell the difference?

Thanks much
Jacob