Let me see if I have a pic that you can get an idea from, if you had to remove the heater box you could always get an aftermarket setup to fit under there, they are kinda small and dont cost an arm and a leg. Not very good pics here of the passenger side but can run the cross bar under the dash and the ones going out the the frame run along the kick panels. This is a 14 point cage, depending on who you talk to it could be more like a 16 point.
http://www.forabodiesonly.com/mopar/attachment.php?attachmentid=189502&stc=1&d=1289448785
http://www.forabodiesonly.com/mopar/attachment.php?attachmentid=189503&stc=1&d=1289448938
http://www.forabodiesonly.com/mopar/attachment.php?attachmentid=189504&stc=1&d=1289448932