This is a buttplate for the Winchester Model 101 Over Under Shotgun 20 Gauge, Olin-Kodensha Manfactured in Japan. It is a reproduction of an original buttplate made in the US, from high-quality urethane. Your buttplate comes with fitting instructions, as some minor fitting MAY be required, but not always. Dimensions are Approximately 5 1/8" X 1 9/16". Allow for a slight variance in measurements, because the holes in the buttplates are countersunk making them much larger than the holes you will be measuring from in your stock. Use wp57 Buttplate Screw.
Visit the INFORMATION LIBRARY to download both the buttplate and spacer fitting instructions.