Hemi/tr6060 oil pan?

Just recieved my 5.7/tr6060 combo today out of a 2010 Challenger. For my application I'll probably need the truck style rear sump pan. The Challenger oil pan is pretty substantial cast aluminum and bolts to the bellhousing along the bottom as well. Do I just swap to the truck stamped steel pan and leave the bottom of the bellhousing open? Or am I missing something here?