Good sights for cheap, yes you do have to grind down both front and back - HiViz Interchangeable Litewave Sight Set for Ruger Security-9

Great visibility, bad fit. Had to grind down the front for probably 15mins, and back for probably about 5mins to get them to fit. Use lube! Very good visibility in daytime, and pretty good at night with a light. Given 4 stars because anyone attempting a sight replacement should also be able to do this.