From the pictures I have seen, they are definately correct "deluxe" belts for 70. They were even offered on superbirds.

I would look at it this way, what is cooler a real hemi charger or a 318 charger with a hemi in it? What I mean by that is yes, you could probably put together some sort of buckle/seat belt that would work for you, but they will never be the real thing. Being your car is optioned for them, I would jump all over them IMO because you will never find another set. Just my $.02

Let me know if you decide to pass on them. I won't bid against you as I would like to see you get them, but I would not mind putting them in a superbird I have if you decide not to.