Welcome to the site.
This forum is for introductions. You will get more answers if you repost your question in the Interior forum.
Sorry I don't know any one who is using the stock front seat in their 55's. They are all using buckets.
Gregs Automotive has factory assembly manuals and a restoration guide for your 55. They will be great reference material for anything you do on your Chevy.
http://www.gregsonline.com/eshop/Htm...-car-books.htm