I had Diamondback on my 67.
Was not so happy with the color of the redline.
They looked great for a few years, and then they turned dark.
Diamondback said i could sand them down, as it was red all the way through the bead.
But, even then - they just never looked right. (More Like a dark maroon)
I took them off and sold them with a this car pictured.
Now that being said - I bought them in 97, so maybe they are better now.