Maybe a Mustang supplier sells some that may look right? I doubt more than a handful of people in this world (car show judges and myself included) could tell if they were absolutely correct. as long as they looked legit. I have to guess they would be stamped Motorcraft and a date of some sort? Don't know .... I have spent to much time and effort making my car "Concours Incorrect".
Ford's replacement for top hose is KM615, also fits '70 Mustang with 302. No idea of orig number, the '75 Master Parts lists D2PZ 8260-C for both as replacement.
I used a Mustang hose from a Mustang parts dealer.. The "number" is not correct...but most would not know.