New, Aftermarket walnut stock fits 1894, 336, etc styles.  My require fitting.  

MARLIN® 336, STRAIGHT GRIP STOCK Length of Pull - 13 3/4" Top Tang width - 5/8" Top Tang length - 3 1/16" BottomTang width - 5/8" BottomTang length - 3 1/16" Stock height at receiver - 1 11/16" Stock width at receiver - 11/2" Fitting of trigger spring may be required.