I’ve not seen a finger rest Super mag. My original import package came with two flat bottomed mags. The grip on the gun is plenty long enough that a pinky rest isn’t needed. IMO.
BTW, there is a Super mag for sale over on gunboards. $140 !
Good luck, they are not common and are surprisingly pricey. I actually bought a Super last year just for the finger-rest mag and then flipped the gun with a flat-plate mag. Net cost was around $20
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