Did a little checking and found some KD pliers at amazon. The first link is for 3702 straight handle pliers and they also have a 3704 bent handle plus 3702 a set of both. Straight or bent is a matter of preference and working space (like under a progressive cover installation). Straight would be my default, if you need the excuse the set will cover about everything.
KD Tools 3703 Straight Hog Ring Pliers -...
KD Tools 3702 2 Piece Hog Ring Plier Set -...