This buttplate fits the Marlin model 336. It also is used for models 39 - 80 - 81 that have a larger stock. Dimensions are L= 5 inches W= 1 9/16 (at widest point) middle of top screw hole to top of plate is 7/8 inch and bottom of plate to middle of bottom screw hole is 1 3/16 inch. Center to center of screw holes is approx 2 3/4 inches Use buttplate screws wp57.