It appears Mike is correct and the sling attachments are correct for the Model 44US(b) but not the Model 44US. Probably part of the reason for the "b" designation, that and a lot nicer wood on the rifle in the video. These were apparently post WWII rifles.
By the way, Numrich has what appear to be repros of those detachable sling loop assemblies listed for sale for less than $40.00.
https://www.youtube.com/watch?v=Z7OmZeZ2QyQ