Craig,
As you have summized, no one reproduces the vacuum hoses for the 67...any of them! You best bet is to find good used ones from a salvage yard. Might take you several yards/cars to find a match. Look at any 67 Fords as the smog/vacuum setup was not unique to the Mustang. When I had my 67 San Jose convertible (auto, a/c, p/s, & smog), I found a couple of the vacuum hoses in a salvage yard in the Pheonix area.
Two of the vacuum hoses off of the vacuum tree were striped (green and I think the red one). The hose from the backfire valve was white striped. I do not recall stripes on any of the other vacuum hoses.
Does your Mustang have the vacuum tree on top of the intake heater elbow? This very unique part was only used in 67 up to the May-early June timeframe before Ford moved the vaccum tree to the thermostat housing.
I no longer have my convertible, but I do have pictures that I will look through tonight and see if I can further help you.
Regards,
Pete Morgan