67 Cuda bucket seat reupholstery help needed

The white metallic vinyl is your problem. I install many sets of legendary
covers for customers in my shop and have no problems from a professional
installation point of view from any of their seat covers with one exception.
The white metallic vinyl.
For whatever reason ( probably it is the only product they can find) the vinyl used in manufacturing this color covers does not stretch. Woven backing problem.
This makes these covers very very difficult to install. I ran into this problem on a set of 69 dart convertable seat covers I got from them. I had to steam them next to the point of tearing and
removing the grain in a few of the tighter areas.
Wish I could give you better news but that was my experience with that color from them.
I just installed them and moved on and never let them know about the problem. They know already believe me. At least the person sewing them knows. Everything else I receive from them is as good and better than anything out their available.
These covers will not last as long as they should because the material won't stretch as it is being used. I haven't got a call back on the job but I know they weren't as durable as most covers they make. If you must have that color this is what is available at this time. I personally
think they should not be using this material and would be better off not tarnishing their name
over a flawed product.
Be very careful and take your time. I was able to get them on but not by myself.
The rear convertible seat cover was the worst in my case. You should be alright with the
front buckets.