81-018 but different hole spacing

I've been trying to find replacement rollers for my patio door, but i've been striking out. They look identical to 81-182 (though not stainless steel), but the tabs are slightly shorter and the mounting hole spacing is 5-5/8, not 5-3/4. I don't know who made the door, there is no label on it I can find. So far all the assemblies I can find that are similar have mounting holes spaced 5-3/4.