Front framerail components needed!

Good afternoon everyone!

So we started cutting apart the front end on my Duster today. We knew the lower front portion of the drivers side frame rail was going to need to be sectioned and replaced, but we found a bunch of Bondo, and it looks like the two top plates will need to be sectioned as well.

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Obviously, the RH side is perfect....
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Problem is we cant seem to find these pieces anywhere online. Is there a vendor that has them, or can we use a B or E body set of plates?
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We bought this kit to section the lower half of the frame rail, https://www.classicindustries.com/product/1974/plymouth/duster/parts/mm8154.html

Any help would be great!!
-Ashley