I have a Win M-63, 22LR Autoloader, mfg'd 1939, with tang drilled and tapped for sight. Have acquired a mint, Lyman 1A sight but no mounting screws. Pulled the plug screws on my rifle and they appear to be 10-36 or perhaps 3/16-36?? I know the tang screws for Win M-94 etc., are 3/16-36 and suspect mine are same size. Anyone know correct size and maybe a source. Have checked with usual sources, Brownells, etc., but no success. Thanks,