I like the flat sided feel of Pachmayr Grippers but I don't think they've made them for N frames for a long time. I've used 2 sets of K/L Grippers and they
've fit for me, others say they won't fit their gun. They do eventually tear in heavy recoiling guns, at least they have for me.
I also like Hogue Monogrips, and the factory wood stocks that I have, finger grooves and all.
All of mine have an open backstrap.