this picture may help ya....usually they are worth a 100 words...and that's close to what VA72C10 worte
(BTW...67/68 had the hand operated ebrake, 69-72 has foot operated ebrake)
Couple things about where to get them....first off you may want to look in the parts board for folks parting trucks (make sure you specify if your truck is short or long bed), or I think you can order complete from inlinetube.com