67 Rallye Dash Conversion-Internal bracing/brackets

Good morning everyone. I'm in the process of taking a spare 67 barracuda standard dash frame and converting it into a Rallye Non-AC dash that will eventually go into my 73 Dart(Thanks to everyone who has contributed help and/or parts for this project). I went with the 67 due to the Knob-style radio that I already have, and because that was what parts I had access to at the time. I've heard talk before that in Rallye dashes, there are extra braces and plates to stiffen up the cluster? And one or more additional pieces that's used for the climate controller and/or Radio? None of my searching has really given me anything definitive and I'm curious "What" is in the dash, and if those pieces can be acquired in the aftermarket. If not, what are they actually called so that maybe I can search around and find used ones. Thank you!