Here's one of my favorite threads Since I assume your not interested in 2 or 3 piece rims, there were 2 one piece original wheel sizes 17.5" shown on post #98 and 19.5" shown on post 108. 16.5" where aftermarket, but period correct(post #85). THese rims are not easy to find today, but are cructial for a correct stock resto
http://67-72chevytrucks.com/vboard/s...+trucks&page=4