For sale is a set of M119 aluminum oilers tubes, from what I believe were made by the first molds.
If you look at the shape of the tube, it is "blockier" than the later aluminum oiler tubes.
The part number is the same as the later ones:
Part No: 119 187 00 87
The second picture compares the oilers from two different molds.
The oiler on the right is the "blockier" one.
I don't see an advantage or disadvantage.
I personally would not install these, rather, I would keep these as a collector item.
$215 shipped to CONUS