I was given a model a the other day and among the parts were these model a spindles with disc brakes. The guy said he thinks they were from a Volvo. The bolt pattern is smaller than a model a and they may be from a trailer.
Look like 65-67 Volvo 122S hats. They would have a late Ford /Mopar bolt circle 5X4 1/2", same as a pre-war Willys. These were a very common swap to early Ford spindles back in the late 70's early 80"s