One marked A is 1/4" offset and the other one marked B is 1/2" offset
A handy person from Columbus says:
November 28, 2017
roller is 3/4" diameter
roller is mounted on metal 2-1/8"L x 1"W
Mounting metal plate is 2-1/4"L x 1"W; screw holes are
1-3/4" apart.
Part A is offset 1/4"
Part B is offset 1/2"
Paul from SWISCO responded:
November 30, 2017
For the Part A roller, our 23-011 closet door roller assembly should work. And for Part B roller, our 23-012 roller assembly should make a good match for you.