Marty, the vacuum canister location is yet one more item subject to changes in 67. Could also have been variations due to options also - but probably just a running change thing. The diagrams you mentioned generally are the latest revision, and show where they ended up (possibly in 68) - not where they started. I've seen the early model year cars with the canister located directly below the passenger side hinge in the engine compartment. On cars without, in that area there are two dimples in the sheet metal that line up with the canister bracket. There is also reference to canisters that are mounted under the battery in the fender well (and subject to objects thrown by tires) but I have not seen one like that for 67 - I'm thinking 68 but don't have facts to back that up.
I think there are other posts about this here - including style/location as well as hose type/stripe colors. There are some older posts for sure on the vintage mustang forum if not here.
Some pictures below. The one named 11-10-66 can is the style that I have also (Dec 66). I have a collection of 3 or 4 of this type at this point. Yes I can stop collecting now, I know. But you know how you keep finding deals that you can't pass up? As for connections, this style has two for sure, one to the manifold and the other to the column. There is a separate metal check valve, stamped from a company called "Trico" or "Trinco" - don't recall. I can dig that out and provide some pics if you need it.
The Cougars had a much larger canister for the hide away headlamps, located I think on the driver's side behind the headlight under the fender.
