I felt the same way Alex,
I bought mine from southern street rods, but I was told they changed the design. They have a website www.southernstreetrods.com I think. They are also reasonable on price, 44.95 per person when I bought mine. I had to move the upper mounting point forward but I used the stock locations on the bottom. If they redesigned them they may fit differently.
I have had a couple sets restored by Dallas Mustang Parts. Send them your seat belts, they rewb them and replate all the plated parts plus supply new mounting hardware. The finished product looks better than New Old Stock.
They can be reached at 1-800-mustang or on the web at :