If shumacher doesn't have any and mancini sells out their stock, then mancini is at the mercy of shumacher to make another run...
I have seen from other posts that mancini and shumacher are out of stock on the 340/360 a-body mounts also...
Once the production tooling is made for the parts (which it already has been made from previous runs), all they have to do is order the proper thickness of metal... Cut the metal to the proper shape, punch the holes for the mounting bolts, and put it in the press to bend it....
I know the metal is available, so there is no reason that they shouldn't be able to make another run of them...