Do you mean the belly side of the riser, like a Brakenbury? Only threaded quiver inserts I've seen on the back of the riser are on older Wing one-piece bows. Not familiar with Palmers, but if they're the same, a Wing quiver would work. Deltas I've seen are made to fit on the side of the bow, but I suppose mounting brackets/arms could be made to mount it from the front or back of the bow. That's in effect what Wing does. Don't believe the Wings are made anymore, but they turn up quite often on the big auction site.