Difference in manifold heat stoves from 70-71 and 72-74?

[WH23G3G]

I'm missing the LH exhaust manifold heat stove on my 73 Charger 400, 4bbl. It has 73 HP exhaust manifolds. It should have the heat stove bolted to the LH exhaust manifold and a foil hose running to the dual snorkel air cleaner. But it's actually been the hardest thing to find since I've had this car 7 years. Actually the only time I've seen them were a few years ago at the Mopar Nationals and there were tons of them guys had for $10-$20, wish I would've got one. At the time my Charger was so far behind, that was the last thing I was worried about. Now it's running and everything's there except that. I know it doesn't really matter, but I want to have it there. I checked the 70-71 parts catalog and it shows an upper and lower part of the heat stove which is the one being remade. But I also have the 73 parts catalog and it only has one number and is only a one piece stove. It looks similar from the ones I've seen but doesn't have a bottom piece. Aren't the big block HP manifolds from 70-74 the same? Could I get a 71 reproduction heat stove and it should fit?

[Nacho-RT74]

72 and lates is one piece.

71s are two pieces, one below manifold, the other one on top like the lates.

I think there are some differences on casting matching, not sure though