Nut (371) ref 90179-08004
SR400, SR500, TT500, XT500, XS500, XS750, XS850, XV1000, XV1600A, XV1700,... fits 150 models from 1976 till now.
 
NUT CAP 126111716000, ref 90176-06002 or 126-11171-60
GT50 , GT80, FS50, RD125, RD60, YG1K, .... fits 59 models.