no different due to fork tube diameter, the 278-23144-50-00 SEAL, DUST is used on these models and components:
1970 R5 FRONT FORK
1970 RT1 FRONT FORK (RT1B,RT1MX)
1970 RT1M FRONT FORK (RT1B,RT1MX)
1970 XS1 FRONT FORK (XS1B)
1971 DT1E FRONT FORK
1971 DT1MX FRONT FORK
1971 R5B FRONT FORK
1971 RT1B FRONT FORK (RT1B,RT1MX)
1971 RT1MX FRONT FORK (RT1B,RT1MX)
1971 XS1B FRONT FORK (XS1B)
1972 DS7 FRONT FORK
1972 DT2 FRONT FORK
1972 R5C FRONT FORK
1972 RT2 FRONT FORK
1972 XS2 FRONT FORK (XS2) (TX650 - )
1973 DT3 FRONT FORK
1973 RD250 FRONT FORK
1973 RD250 FRONT FORK RD250B
1973 RD350 FRONT FORK
1973 RT3 FRONT FORK
1973 TX500 FRONT - FORK
1973 TX500 FRONT FORK
1973 TX650 FRONT FORK (XS2) (TX650 - )
1974 DT250A FRONT FORK
1974 DT360A FRONT FORK
1974 RD250A FRONT FORK
1974 RD350A FRONT FORK
1974 TX500A FRONT - FORK
1974 TX500A FRONT FORK
1974 TX650A FRONT FORK TX650A - XS650B
1975 DT250B FRONT FORK 250B - C - 400B - C
1975 DT400B FRONT FORK 250B - C - 400B - C
1975 RD250B FRONT FORK
1975 RD250B FRONT FORK RD250B
1975 RD350B FRONT FORK
1975 XS500B FRONT - FORK
1975 XS500B FRONT FORK
1975 XS650B FRONT FORK TX650A - XS650B
1976 DT250C FRONT FORK 250B - C - 400B - C
1976 DT400C FRONT FORK 250B - C - 400B - C