Here is some good vacuum routing information.
VIN locations
Here is some good Vin information for the 1966-1977 Bronco frame.
U13 is the roadster
U14 is the half cab
U15 is the Station wagon
Here is some good Vin information for the 1966-1977 Bronco frame.
U13 is the roadster
U14 is the half cab
U15 is the Station wagon