Meatsaw - The 10/600 Series clutch drums were available with both the large and small splines, if you have the large spline rim sprockets, just change them for the small spline version to fit you drum(s) or find one of the large spline drums. If you did not know it already, the same clutch and drum assemblies fit the 600 Series saws as well as the 10 Series. The only exception were the SP80 as they had a peculiar clutch and drum to themselves, but even those can be swapped out for the more conventional 10/600 Series version.
Mark
Mark