Andersen Sliding Glass Door Wheel Replacement Markings on the old wheels are, B 7116-5, F 7116-5

Looking for replacement tandem wheels for this set of Andersen SGD. Homeowner belivese they were installed in 1958, original to the house. The front wheel on the latching/lock side is stamped F 7116-5, and the wheel on the opposite end where the two SGD panels meet is stamped B 7116-5.