Patio door rollers

I need to replace two rollers assemblies on on of my patio doors. The tandem roller shown on your web site does not look the same, but it may work. Have you had this issue or question? If you can provide the outside dimensions, I may be able to check.
It has two steel rollers 1-1/4 inch diameter and the width of the roller wheel is 5/16 inch. The frame is 1-3/4 inches long. Here is a pic.