I have a 68 Newport. I know you can send the thumb wheel radios to have them upgraded with blue tooth/am/fm ect
My question is can you buy a kit to do it yourself???
The company which supplies most of the add-in electronics to modernize old radios is called Aurora Design. However, they don't want to deal with the public (I tried) and will only sell to radio restoration/conversion specialist shops to do the installation. Home
Instead I purchased a RetroSound Redondo radio, which is a new stereo with USB, bluetooth, etc. designed to replace a factory Mopar radio using the original faceplate. I just started getting ready to install mine last night. Mine uses the two shafts but they also sell a version of the Redondo with thumbwheel controls. RetroSound Redondo Radio for classic cars
The Redondo radios have an LED digital display but you can get screen protectors with a picture of an AM tuning dial on them so that the radio will look completely stock when it is off.
They're probably not supposed to, but this dealer will apparently sell you the Aurora Designs modules to DIY the conversion. Stereo Conversion Kits for Classic Cars
I never used them but these guys came up in search I did once. Sounds like they have people from the Huntsville Electronics Plant that made the radios to begin with. Ward's Classic Car Radio Repair