Looked in a Dec 67 MPC and from what I can tell it wasn't serviced at that time. Was trying to provide at least measurements for comparison. (Length and width)
There is a 170 Bronco listed but don't know the differences but there likely were
Looking through a 66 Ready Reference I found that it only shows tools to determine a replacement- you provide the measurements and they they provide a part number. It also has a conversion for the markings from the fan belt to a part number. That's it
The Ready Reference doesn't surprise me since they made (for service parts) belts for every application they could and made allot of non-Ford applications so a list of all the belts would be giant. Sure there is one but don't have one, that list every belt