Could it be a "retro fit" from another jeep model? I say that because my '54 3B had a noticeable bend in its drawbar. Signs of a much rougher life before I got it. A long search and a chance encounter at one of the earlier Fall Reunions in Jefferson City, MO, I found a replacement. It was from an earlier jeep (not sure of which) as the support arms were bent up and attached on the back of the drawbar. But for me the short attachment arms, straight down from the rear crossmember, were straight - and so was the drawbar itself. Those support arms were fixed to match being attached on the bottom. So, my jeep no longer has the "original" drawbar but a donor.
For me, the first thing I'd do is see how those arms were possibly attached before the bolts (there may be some old welding remnants): Bent up and attached on the back or attached on the bottom. There was a writeup from Oldtime about the frame progression that pointed out the thickness of the frames being one distinction between the 2As and the later 3As/3Bs.
The drawbar I have now has 10 holes in it and from appearance, they look to be a bit bigger than those 6 holes in your image. Sadly, I have just the one jeep. I can't compare all the different CJ models through the years like others. You know. The lucky ones who have 6 or more jeeps.
I will say this is the first I've seen bolted to the support arms though.
