I would order the parts from Skinner and have a smith install them. They have to drift out the old and drift in the new. If this is done incorrectly, you will not be happy. Andy is the owner of Skinner Sights. Very cool guy. If you have questions, send him email. He will respond pretty quick.
Winchester 100 .243; Marlin XS7 .308; Stevens 200 .223; Rossi 92 .45LC; Marlin 1894C .357M; Marlin 30AS .30-30; NEF Pardner Pump 12ga; Mossberg 500 Turkey 20ga; Winchester 1200 20ga; Savage Mark II F .22LR; Henry H001 .22LR; Marlin 60SB .22LR; Ruger 10/22 DSP .22LR; Browning SA-22 .22LR; Savage 93R17 GV .17HMR; Remington Genesis .50 cal ML; Ruger SR1911 .45ACP; Ruger Vaquero .45LC; Ruger Blackhawk .357M; Ruger SR9c 9mm; Ruger Single-Six .22LR; Browning Buck Mark Camper .22LR