Swap 67 dart turnknob radio to 68 thumbwheel

How much trouble would it be to swap a thumbwheel radio into my 67 dart. I have also noticed that the temp controls are different. Wouldn't mind keeping my style radio but it doesn't work very good and it is difficult to find a good working one and I don't want to spend a fortune trying to fix it. The thumbwheel type can be found all day long for reasonable prices.