radio interchange question

Looking at all this, it is clear that neither Retro Radio, nor Vintage Radio know what their radios actually fit. Retro is selling knob radios for "1969-70 Darts" and Vintage thinks they have no radio to fit a 70 Dart, but I would bet that the knob radio they sell for a 1970 B body would fit.

This does not surprise me when several vendors sell 1970 "Dart" script that never appeared on a 1970 Dart, and the seat covers for my 1970 Dart Custom appear under Dodge B-body in two major catalogs...

Does anybody have a 1970 B body dash frame or knob radio that they can do some measurements on to see if the openings are the same as an A body?

I really want to thank those who have taken the time to help figure this out. It's hard to find a modern radio that fits in an A body dash without cutting things. There are some nice, but expensive alternatives out there. My 2 other 1970 Darts have original AM radios converted for AM/FM/RCA input and that company now also can add blue tooth - a literal Mom & Pop business that I found at Carlisle. The big thing that I don't like about that is you have to switch the radio on and off fast to trigger change from AM to FM and some times it works and sometimes it doesn't, sometimes it takes multiple tries, and some times if you are listening to the radio and start the car, you end up switched to AM and then you start turning it off and on trying to get the FM station back. Oh yeah, and that it costs almost $500 to get one done...