I made contact with S&W Tech assist today, told them the problem along with a few choice words about the design. Rep wanted to say that the baseplates were not interchangeable until I told him the mags were identical and I had already tried it . In short, the 6 round replacement baseplates an retainer plates are being sent out to me a no charge.
I'm happy.I didn't care for the 7 rounders much either due to the larger footprint on this small size pistol.

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Blessed be the Lord,my Rock