All I can find on Y1 and laysons is the electrical engine harness. I have a line on a used one thoughWalterLeeJackson said:Year One, and only Year One from my search, has the wiring harness for 1964 A bodies.
By the way, I wouldn't be so hard on Layson's. They are the only ones reproducing some of the necessary parts.
If you can do better, either by making your own or contracting with a manufacturer to make some for you, then God's speed to you.
If you find anyone else making them, especially for less money, let us all know.
It's just too easy to be dismissive and cynical in this hobby.
1963 Dodge Dart GT convertible.