Sliding door hardware

A home owner from Massachusetts says:
Marking are: in a square box large L with B inside the L, us pat. 3.041.657, can.673.636(1963)
Around hole with flat screw inside it says ."to lower door with arrow pointing down
Both doors appear to have same size parts-1/2".
User submitted photos of a door roller.
Profile picture of Tom
Tom from SWISCO responded:
Hard to tell what the offset is based on these images, but look at our 23-031 and 23-047 and see if either of these can work for you.
A home owner says:
Would a different view help you decide offset? If I measure indent on the wheel part it is 1/2 inch but both doors have the same 1/2 inch hardware. Is that unusual?
A home owner from Ma says:
Does this picture help determine size better?
Profile picture of Paul
Paul from SWISCO responded:
No, that's not unusual. Some manufacturers have their track set up with the same rollers for front and back doors.
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