What 100IH said.
The Restoration Guidelines are an invaluable book for such details. Even if you never plan to enter fine point. When repairing or replacing a part just knowing what is "correct" for the year is a breeze. As it is often as easy to use the part correct for your your year as it is just any part why not just do it right. I have on several occasions offered a "money back" guarantee on the purchase of the book, offering to buy it if when received they found it not to their liking. Never had to buy another book.
