I will see what I have. The wheel soften get chunks broken out of them, possibly someone has tried using a tyre lever to get the tyre off, the wheels split and do not have a well like normal wheels. Later wheels were all steel.
You should be able to get an exhaust and air cleaner from Meetens. Engine should be a Villiers Mk10, I wonder if somebody has changed it at sometime? Photos would be good to see what you have.