Go to http://www.limbsaver.com/technical/templates.php
and download "all recoil pad templates" pdf file. You can look at their measurments and compare to your stock butt plate size then print life size templates that are close to your stock measurments. Cut them out and lay them against your stock to find a fit. They also offer grind to fit and slip on pads and show sizes. The Limbsaver may slightly increase the lop.