I have heard that if you call S&W they will send you a couple. I meant to do this after I got 2, 17 round magazines as part of a rebate but never got around to it.

My 2.0 compact came with two adapters. If nothing else you can call and mention your gun only came with one.

If you do find a source let us know.

I am not sure why polymer parts like this are in short supply. You would think once they had the dies setup they could really crank them out. Same goes for grip inserts. I would like to try sanding one down but since you cannot unsand something I am hesitant to do so unless I can buy a replacement.