The 41-48 radio will fit. Some have the side mount or support to share the load of the radio while the heavier ones used a rear bracket..
The buttons on most 41s have not held up very well. I think there are vendors who sell replacement push buttons available for the five tube and short wave. Look pretty good for the short wave but not so much for the 5 tube.
The shortwave and the 8-tube were heavy and used a support on the rear that connects to the firewall.
There was a cheapest one just stuck through the dash with blanks to fill the holes where the knobs would be on the others. It didn't do much for the overall looks of the dash. Neither did the 8-tube with its black buttons.
I would get a 47/48 and put it in because most folks wouldn't know the difference. They are the same size as the 5-tube. And, what's more there are a plethora of them out there.
Good luck finding a good 41 radio. I have a couple decent looking 47/48s that would have to be gone through. Usually a vibrator and OZ4 tube is all they need to play.
Best,
Charlie
I hauled an 8-tube and a shortwave to Carlisle and Hershey. Both were in super nice, show-shape with good buttons and knobs, etc.. Not a bite on either one at either location. Go figure. They're back in the garage now where they'll sit again for another right good spell. To heavy to ship or lug around. Are too! They're not for sale any more.