Shorter than what? John wrote that they were the same as standard Firebird hubs.

John's Quote; Jim's hubs are the same as the standard Firebird hub. It's my opinion that the mysterious "taller" hubs are either a heavy duty '68-69 (because they didn't offer HD drums in '67) option, but more likely just somebody replacing a hub & drum unit with a junkyard version obtained off of a Tempest or GTO. I have a picture at the bottom of this page showing the difference between the two hubs: http://john.my67.net/Suspension.htm