1/2" offset Door Roller, Rear

I'm needing help in locating the sliding closet door rollers in the pic "rollers". They are from a dormitory on our campus built in 1969. These are the only pics our tech was able to get me. Hopefully they will be a start. Thanks

I need to replace two upper mirror door assemblies. There are two wheels on the top . The measurements are 3 1/2 inches across X 2 1/4 inches in height.

Looking for a complete assembly or even just the wheels for this hanger

Wheels are three-quarter of an inch diameter by about 3/16 inch thick. Name stamped on assembly is "grant rocket". Diagonal slots allow for raising or lowering the wheels over the door.

Looking to see if it's possible to replace the hardware to my heavy wooden doors. The rollers I see in your catalog are very similar however they are single wheel and the dimension of 3/4 is too large. My wheel is much smaller. If you do not have a replacement for my rollers, could you advise me ... (cont.)