In 69 they changed over to the slide on type. You could have an early one with the thread on style. If you do not have the spring clip for the slide on and you have threads, then you definitely want the screw on cable. This guy knows his cables and will fix you up for $20 plus shipping.
LINK: http://cgi.ebay.com/ebaymotors/67-68-69-...1QQcmdZViewItem