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.
They measure 11" wide across the shock mounts, 9" from shock mount to fender bolt mounts. The fender mounting brackets are inset to 9 5/8" width across. where the dim rise is approximately 6" and total length is 30"
These Amco racks are gorgeous. The chrome looks like it is poured on. I know it does not fit a Honda CB750 but it would be a larger displacement bike. 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.