PJ don't do a metal bracket Q, your best bet is to contact Skatehut and ask them about the poweriSer ones. You will be waiting a while though, they're notoriously slow. Might also be worth asking Manni if he has any 7's ones spare, although it's unlikely he will as they only come with the cuffs, you can't get them as a separate spare part yet.
It's well known the PJ cuffs don't fit onto 7League frames without the metal bracket, due to the slight difference in sizes on the bars.