There is no compact 9mm double stack TSW. There is a full size 9 double stack (5906/03/46 TSW) and compact 9 single stack (3913/53 TSW). As i said in the other thread, trying to mate a 3913TSW slide to a 4013TSW has some complications
The Shorty 9 is the closest thing to a 6906TSW that S&W ever made
True, and you could consider the Stocking Dealer 9 a long-slide steel frame Shorty 9 as well. They are pretty low quantity offerings, even compared to the Shorty 9 at ~611 units so using any of them as a conversion slide is pretty unlikely