the part # for a 77 is 1U3-23340-30-33 also used on these models, so the anwser is yes
1977 XS650D FRONT FORK XS650D
1978 XS650E FRONT FORK XS650E - E006501- - F
1978 XS650SE FRONT FORK
1978 XS650SE-11 FRONT FORK
1979 XS650SF FRONT FORK
1979 XS650_2F FRONT FORK
1980 XS650G FRONT FORK
1980 XS650SG FRONT FORK
1981 XS650H FRONT FORK
1981 XS650SH FRONT FORK
1982 XS650SJ FRONT FORK
1983 XS650SK FRONT FORK