The Griggs Racing "though the floor subframe connectors" aka the frame kit will work. They provide much better support then any external subframe connector, but installation is not fun. They run from the front bulk head and though the rear subframe (where they should), which means no loss in gound or exhaust clearence and much more effective bracing, but you have to pull the interior out in order to install them (ouch). Just a thought.
http://www.griggsracing.com/