I have substituted the Swisco
26-150 for ~1995 Weather Shield pivot pairs. It seems to work. You do need to slightly move the Swisco downwards on the wood sash to have the zinc triangle in roughly the same position as the OEM part. I used the lower of the existing screw holes in the sash for the Swisco upper screw hole and then used a 15 gauge panel nail through the Swisco triangle opening.
The photo shows the old WS pivot part with the new Swisco pivot part.