I bought 2-- cr0811 df rollers from FPSmith and they fit in my frame well
i put a straight edge accross the rail mating surface of all 4 rollers and the new ones were 1/8 to about 1/4 inch higher---but i had built up the old rollers with weld so i don't know how correct the measurement was.
I don't have a reference for those part numbers but it could be one is for the single flange rollers and the other for double. New roller diameter is 7.0 in.
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