The three top identical Grease gun adapters in the picture, unused and still partly covered in protective goo , are for sale.
They are unmarked, and are of the 41-A-14-825 kind.
I would not consider them as factory correct,but rather late war motorpool.
30 $ each plus shipping from Italy. (To U.S.A. 12 $)
P.S. Wingnutt got one in a trade, and can tell you the quality!