I went with a Woods Trophy Mount on my Black Diamond XR from Cabela's. My book for Weaver bases says.. Weaver Top Mount Detachable (front and back) Base #4 Gloss 686-885 $6.95 Silver is Base #4 835-948 $6.95

If you're placing your order with Natchez, call them on the phone and they will look up the different makes of bases you want.