2002-05 Owners. As of August 2022 there is now an entire suspension kit for sale! Scroll down to the bottom of the first post click here.
I updated my wife's 02 Tbird to a double din with Bluetooth, DVD, CD, USB and a backup camera she loves it. You will need a 2din face plate, a steering wheel control adapter and a 5 Volt adapter to prevent stereo pop in the speakers. I highly recommend Crutchfield they have great customer service and have package deals that includes everything you need including step by step instructions.
I installed a Pioneer beside the adaptors I mentioned earlier you will also need am adapter so you can use the factory amplifiers and speakers with whatever head unit you choose. I bought all of my wiring harness adaptors from Crutchfield and picked up my head unit from Walmart. It was cheaper to do it that way. I also had to enlarge the opening of the 2din face plate so the head unit would fit correctly. I ysed a Dremel tool to do with a barrel sanding attachment. I took my time and ot looks good. Well worth the effort.