Pat. # 3750337

Like others here, I'm writing to ask about about Pat. # 3750337 sliding closet door hardware. We have only this one top roller-hangar piece (need 4). In looking at the links to photos of available parts you've suggested might work... I just don't see how. Our doors have two small rubbery rollers, where nearly everything else I've seen has a single nylon roller. Plus, our two rollers are attached diagonally to each other, on top of what is an empty "flat roof-looking" piece of the molded plastic core. Is there hope for re-attaching these original doors?  Thank you!