I think those mics are all mono: they only have one diaphragm in them.
I suspect your “stereo” recordings with those mics were actually dual-mono,
which looks like stereo, but both the tracks are absolutely identical.
You can add a pseudo-stereo effect by duplicating the mono recording
and joining those identical tracks into a dual-mono pair, then applying a pseudo-stereo effect to that dual-mono track.
IMO, “stereoize” on the free Ozone Imager plugin produces a realistic stereo effect from mono originals…
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(Other pseudo-stereo plugins are available).