I have this on my 1903 M-S. Admittedly the rifle was pretty abused when I got it and I might otherwise have chosen a more elegant solution. http://www.wattswalnut.com/ms_scope_bases.php

One of my other M-S rifles has a Griffin and Howe side mount (already installed when I bought it) and another has traditional German claw mounts (bases already in place when I bought it). I still have a takedown 1903 with no scope and haven't yet decided what I want to put on it. I missed a chance to buy scope with a complete claw mount system (bases and rings) on a German auction site, but I guess I will just keep looking.