Hi, I noticed that you have made some Model A heaters in the past. Have you ever seen one like this? It is a "Directors Special" heater manifold and it also has the "Trumpet". Both come together and vent through the firewall. Also, it's a bit hard to see in the picture, but there is a round cover in the exhaust manifold just to the rear of the the intake manifold. It can be rotated open or closed , presumably to vent some heat when it is not needed before it gets to the firewall door. The flexible metal tubing of the trumpet is rusted through behind the carburetor. I believe it is 1.75" OD. Would you happen to have some of the flexible tubing? Thanks