only seeing it as an option for Valiant/ Barracuda.
The 1970 Hamtramck Registry - 1966 Plymouth Salesman's Pocket Guide
The 1970 Hamtramck Registry - 1966 Accessories Catalog (Page 1)
You'll be fine. Just will have to shell out for some good shoes. Porterfield and Rochester will reline and arc them. And there's a couple guys selling older stock and even factory shoes.