I'm rejuvenating this thread for a friend who has a '78 Monaco. His car had the same problem as the OP's Magnum, and he was wondering about the eBay kit that I've linked below.

http://www.ebay.com/itm/Mopar-75-76-77-7...W-/401103373624

The description is vague... does anyone know how difficult it is to install, if any special tools are required, or if it is a decent solution? Of course, if there is a better solution out there, he'd like to know about that as well.

Thanks!