rear roller for sliding door

Hello,

We've related three rollers that appear to be similar to yours. We do have others that are similar but these three look the closest. The 81-023 roller housing has a height of 1-1/4 and a thickness of 11/16" with a 1-1/4" wheel. 

The other two rollers I picked out have the same housing height of 1-3/8" and a thickness of 3/4". The difference is in the wheel size. The 81-278 wheel is 1-1/2" in diameter and the 81-279 wheel diameter is 1-1/4". Take a look at these three options to see which one matches up to yours. Also, take a look at the related mounting screws. Thanks for posting!