There is no such thing as a WR5 keyway. The keys for a Weiser from 1960s would accept a WR5 key but the original key would have been the WR3. They are interchangeable.
Not quite sure how I can be any clearer.
My 1976 Ilco key catalog shows only the earlier bow, known as 1054WB. I've worked on really old Weiser locks 1955 vintage where you disassembled them by removing a large clip which allowed the entire knob to come out, then you had to use a special tool, known by the creative name of Weiser tool to hold the retainer cap while you unscrewed it with the key. Even these still had the same keyway.
Up until the present when they use the Kwikset Smart Key system they have had one keyway only. Falcon used to be the same company and they have different keyways.
Se below, the keyway is the same for both shape keys.

