Chandler 406RB Low Shank Presser Foot

[dabneytr]

I have a walking foot badged as a Chandler 406RB, but no other markings.  The presser foot is a low shank 3/4" where the height is 1-1/8".  Everything I see for sale have a total height of 1-5/8".  Also the inner foot has an attachment diameter of 1/4" to 5/16" which is larger then then what I see sold with a diameter of 3/16". I included pics of the machine and the current feet.  I also included a picture of the my feet (lower pair in pic) compared to what I bought (top pair).  The top pair doesn't fit due to the inner foot attachment diameter being too small and the outer foot overall height (that slips into the shaft) is t high as well as the shank height (Screw height of ~1").

Can anyone identify the original machine this may have been badged from? Can anyone tell me where I could purchase presser feet for this machine.  I attached a few pics.  Thanks in advance for any help!