Hmmmm not sure. They look the same, only difference could be the bore size of the plunger. Heres an idea - go to your local REAL Honda dealer and sit down with him and his microfiches. All Honda Part numbers have a three letter code in the middle of the part number which refers to the FIRST model that part was used on.If the three letters are the same for the plunger on a 70-76 bike as your K8, then the seals will probably fit.
Phylo