You still didn't answer if these indents are on the bottom sides of the rails. Maybe you looked, and just didn't put it in words here.
If one and the same rail was made for both sides, then the opposite rail would have an identical indent to the bottom side. Looks like the indents are in different locations at the top from one side to the other in photos. But do they have the indents on the bottom that would match the other sides top?? Of course this wouldn't matter if there was a right and a left side of these made.
But if there wasn't a left and right side of these made, and these indents are the only thing that makes them left or right, then this would further substantiate your theory. That they ARE there for a reason.
Barnyard makes a good point about the M's having the same engine (other than being Super) and near identical frame rails since 39. Why no identions until 53 super W6? If for carb and oil filter drainage, they would of already known this from running frame rails on the preluding M's with same set up to the frame rails.
The point about the diesels is a good point also. Maybe a connection to them, and yours had an engine swap at some point.
Have you seen other 53 gasers with these frame rails?? Or just yours? I don't know why I just asked that, because I'm under the impression that you have. And I'm not doubting you.
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