New old stock product. Purchased from an old line Honda dealer who stocked lots of OEM and high quality replacement parts in the heyday of Japanese imports but is now closed. Unfortunately it was not marked as to which model it may fit.
These Amco racks are gorgeous. The chrome looks like it is poured on. I have taken some pictures with measurements, please compare it to your particular need. If it fits you are getting a real bargain price wise, and I will know what the other two racks will fit.
It is close but did NOT fit a 1977 CB750A Automatic.