Unicorn Hardware, pre 69 front 10 inch small bolt pattern any advice ?
Not a unicorn AFAIK.
1968 is confusing in the aftermarket books but it shouldn't be.
1968 Model Year is different than '67 only in the shoe frame uses tabs.
This change is mentioned in the service manual and the Master Tech Conferences.
Changes to brakes Sixty Eight Service Features (Session 242)page 13
from https://www.web.imperialclub.info/Repair/Lit/Master/index.htm
The big change occured starting Jan 1, 1969 - and that does effect the hardware. Starting in 1969 the adjusters were reversed to work with the new self adjusting system that moved up the wheel upwards instead of downward.